How to Choose a Strap-On: The Complete Setup Guide
A strap-on isn't one product. It's a system: a harness that fits your body, a dildo that fits your partner, and a connection between them that holds everything stable while things get energetic. Most first-time buyers don't realize these are separate decisions. They see a photo, assume it's all-in-one, and end up with a setup that doesn't work for what they actually wanted to do. This guide starts with the question that matters most: what do you want to do with it? Then it walks you through exactly what to buy, how to size it, and how to use it without anyone getting hurt or frustrated.
A Strap-On Is Three Decisions, Not One
Before looking at a single product, understand that every strap-on setup has three independent components.
The harness. This is what straps the dildo to the wearer's body. It goes around the hips, thighs, or is worn as underwear. The harness determines comfort, stability, and how natural the movement feels during use.
The dildo. This is the part that penetrates the receiver. Size, shape, material, and whether it's realistic or smooth are all separate choices. The dildo doesn't have to come with the harness. Many don't.
The O-ring. The connection point. A metal or silicone ring that sits in the harness and holds the dildo base in place. Different ring sizes fit different dildos. Quality harnesses come with interchangeable rings so you can swap dildos without replacing the whole setup.
Once you see these as three independent choices, the shopping process stops being overwhelming and becomes a set of simple filters. Let's start with the filter that matters most.
What Do You Want to Do?
Every other guide on this site starts with product types. This one starts with you. Because the right strap-on depends entirely on what you're planning to do with it, who you're doing it with, and what kind of experience you're after. Find your scenario below. Each one tells you exactly what to buy.
Pegging (First Time)
You want to penetrate your partner anally, and neither of you has done this before. The nerves are real. Here is exactly what to buy: a traditional 2-strap harness (adjustable, stable, fits most body sizes), a 5-inch smooth silicone dildo with a slight curve (smaller than you think, tapered tip), and thick water-based anal lube. Do not skip the lube. Do not go bigger "just in case." The receiver controls the pace. Start with external play. Insert slowly. Communicate constantly. The first time is a learning session, not a performance.
Start here: 2-strap harness + small smooth dildo + anal lube. Budget: $40 to $80.
Couples Play (Vaginal)
You want a strap-on for vaginal penetration with a partner. The decision tree is simpler here because vaginal play is more forgiving on size and shape than anal. A traditional strap harness gives maximum stability. An underwear-style harness feels more intimate and less "gear-like." Dildo choice is personal: realistic for lifelike feel, smooth for comfort, curved for G-spot targeting. If this is your first strap-on setup, buy a harness with interchangeable O-rings so you can swap dildos later without replacing the whole system.
Flexible setup: any harness style + 5 to 7 inch silicone dildo. Budget: $50 to $120.
Strapless (Both Partners Feel It)
A strapless strap-on is a single toy with two ends. The bulb end goes inside the wearer. The shaft end penetrates the receiver. No harness needed. Both partners experience penetration simultaneously. Many have a vibrating motor in the bulb for extra wearer stimulation. The trade-off is stability: the wearer's pelvic floor muscles hold the toy in place, and it can slip out during vigorous movement. Strong kegel muscles help. Some people pair a strapless model with a harness anyway for insurance. Not the most reliable option for first-timers, but unbeatable for mutual stimulation once you get the hang of it.
Best for: experienced couples who want mutual penetration without a harness.
Hollow (For ED, Size, or Extended Sessions)
A hollow strap-on has a hollow shaft. The wearer inserts their penis inside it and penetrates their partner with the outer dildo, regardless of erection status. This solves a real problem for people dealing with erectile dysfunction, premature ejaculation, or fatigue during long sessions. It also works for size enhancement: the outer dildo is larger than the wearer's actual size. The wearer still feels stimulation through the shaft material. Key spec: the internal diameter of the hollow core. Measure yourself (soft) and check product dimensions before buying. Too tight is uncomfortable. Too loose and you lose sensation.
Solves: ED, PE, size concerns, stamina. Measure internal diameter before buying.
Double Penetration
DP strap-ons let one partner penetrate their partner vaginally and anally at the same time. The harness holds two dildos (or one dildo and a plug) positioned to hit both openings simultaneously. This is not beginner territory. Both partners should be comfortable with both vaginal and anal penetration individually before combining them. Size down on both dildos compared to what you'd normally use solo. The sensation of fullness is significant even with modest sizes. Communication matters more here than in any other use case.
Advanced. Both partners should be experienced with anal play first.
Orgasm Belts and Forced Stimulation
Orgasm belts strap a vibrator or stimulator directly to the body, typically over the clitoris or against the perineum. Buckle in, turn on, and the wearer receives hands-free stimulation that they can't easily remove or stop. This is where strap-on gear meets power exchange: the person who strapped the belt on controls the experience. Popular in BDSM scenes where orgasm control (forced orgasm or denial) is the dynamic. Some models include penetrative attachments alongside the vibrator. Intensity is adjustable via remote.
Best for: BDSM, power exchange, orgasm control, hands-free stimulation.
Going Big
Some people want size. Not a little more. A lot more. Big strap-ons deliver length and girth beyond what's available in standard models. They're designed for experienced users who already know they enjoy larger toys and want to push further. If you're new to strap-on play, this is not where you start. Get comfortable with a standard 5 to 6 inch setup first. Build up over time. Jumping straight to a 10-inch attachment because it looks exciting in the photo is a recipe for discomfort and a bad first experience.
For experienced users only. Work up to this over time.
Something Different
Unique strap-ons cover everything that doesn't fit into the standard categories: textured shafts, unusual shapes, fantasy designs, inflatable options, dual-stimulation configurations, and specialty items for specific kinks or body types. If you've tried standard strap-on play and want to explore beyond the basics, this is where the catalog gets creative. Browse with an open mind. Some of the best experiences come from products you didn't know existed.
For the adventurous. Browse after you know what standard play feels like.
Not sure which scenario fits?
If you're exploring for the first time and you're not sure what you want yet, start with the pegging or couples play setup. A traditional harness with interchangeable O-rings and a mid-size silicone dildo covers the widest range of use cases. You can always add hollow attachments, strapless models, or specialty items later.
Harnesses: The Part That Holds Everything Together
The harness determines whether the experience feels stable and natural or awkward and frustrating. A bad harness ruins everything, even with a perfect dildo. Three main styles exist.
Traditional Strap (2-Strap / Jockstrap)
Two straps around the waist and between the thighs. Adjustable buckle or Velcro closure. Fits the widest range of body sizes because every strap adjusts independently. Leaves the wearer's genitals exposed (which is a feature for many users). Most stable option for vigorous play. Uses interchangeable O-rings so you can swap dildos freely. This is the default recommendation when you're not sure which harness to get.
Underwear / Brief Style
Looks and feels like regular underwear with a built-in O-ring. Pull on, insert dildo, go. No straps, no buckles, no fiddling. Available in boxer briefs, bikini, and thong styles. Feels more intimate and less "gear-like" than straps. Sized like regular clothing (S/M/L/XL). Less adjustable, so sizing matters. Not as stable for very vigorous use, but unmatched for comfort and a natural feel.
Thigh and Specialty Straps
Harnesses that strap to the thigh, chin, or other body parts. Thigh harnesses allow face-to-face intimacy while one partner rides the other's thigh. Not a starting point, but a genuinely creative expansion once you know you enjoy strap-on play.
| Harness Type | What It Does | Stability | Adjustability | Best For |
|---|---|---|---|---|
| Traditional 2-Strap | Straps around waist + thighs | ●●●●● | Very High | Beginners, all use cases |
| Underwear / Brief | Pulls on like underwear | ●●●○○ | Low (sized) | Intimacy, extended wear |
| Thigh / Specialty | Attaches to thigh, chin, etc. | ●●●○○ | Medium | Creative positions, advanced |
Choosing the Right Dildo
The dildo is the part that does the actual work. Choosing wrong here is the most common strap-on mistake. Four variables matter.
Size
Start smaller than you think. Strap-on thrusting feels more intense than manual dildo use because the wearer can't feel what the receiver feels. There's no tactile feedback. A 5 to 6 inch dildo with moderate girth is the right starting point for vaginal play. For anal/pegging, go to 4 to 5 inches with a tapered tip. You can always size up next time. You can't un-do going too big on the first try.
Shape
Realistic dildos have texture, veins, a defined head. Smooth dildos are uniform and often more comfortable for beginners. Curved dildos target the G-spot or prostate. For pegging, a slightly curved smooth dildo works best. For vaginal play, shape preference is entirely personal.
Material
Body-safe silicone. That's the recommendation. It's non-porous, easy to clean, flexible, durable, and compatible with water-based lube. Avoid PVC, rubber, jelly, and anything that has a strong chemical smell out of the box. The extra $10 to $20 for silicone is worth it every single time.
Base Fit (O-Ring Compatibility)
The dildo needs a flared base that fits the harness O-ring. Measure the base diameter. Match it to the ring. Most quality harnesses include 3 interchangeable rings (1.5", 1.75", 2"). If your favorite dildo doesn't fit the included rings, aftermarket replacement rings cost $3 to $8 and come in nearly every size. A dildo that wobbles in the ring is unusable. A snug fit is non-negotiable.
Sizing for Both Partners
Harness Sizing (For the Wearer)
Traditional strap harnesses are the most forgiving. Most adjust from 28" to 52"+ waist. Underwear harnesses are sized like clothing: check the brand's size chart and measure your hips, not your clothing size. When in doubt, size up. A too-tight harness digs into skin and ruins the session. A slightly loose harness can always be tightened.
Dildo Sizing (For the Receiver)
For vaginal use: 5 to 6 inches insertable length, 1.25 to 1.5 inches diameter is comfortable for most people starting out. For anal/pegging: 4 to 5 inches, 1 to 1.25 inches diameter, tapered tip. For hollow strap-ons: measure the wearer's girth (soft) to determine the internal shaft diameter needed. Too tight is painful. Too loose and sensation disappears.
O-Ring Sizing
Measure the dildo base diameter with a ruler or flexible tape. Match it to the closest ring. The ring should grip the base firmly. If the dildo spins freely, the ring is too big. If you can't push the base through, it's too small. Most harnesses include 1.5", 1.75", and 2" rings. Replacement rings are cheap and widely available if none of the included sizes work.
First-Timer Tips
Practice wearing the harness alone. Put it on, adjust it, walk around, sit down, stand up. Get comfortable with how it feels and looks before your partner is involved. Feeling confident in the gear transforms the experience.
Practice with the dildo attached. Get used to how it moves, where it sits, how hip motion translates to the toy. Thrust against a pillow. Seriously. It helps.
Use more lube than you think you need. Then add more. Especially for anal. Water-based for silicone toys. Thick formula for anal play. Reapply often. Machines don't produce lubrication. Neither do strap-ons.
The receiver controls the pace. The wearer provides the motion. The receiver says faster, slower, deeper, stop. This is non-negotiable for anal play and strongly recommended for vaginal play too, especially the first time.
Start with outercourse. Rub the dildo against the receiver's body before insertion. Build anticipation. Reduce anxiety. Let the receiver guide the dildo in when they're ready.
Expect awkwardness. Straps tangle. Angles take adjusting. The dildo pops out. These things happen to everyone. Laugh when they happen. Adjust. Keep going. The second session is always better than the first.
Talk afterward. What felt good. What didn't. What to try differently next time. This conversation is what turns a clumsy first attempt into a genuinely great second one.
Cleaning and Care
Silicone dildos: soap and water after every use. Boil for deep sanitization if sharing between partners. Store separately from other silicone toys (they can bond to each other over time).
Fabric/nylon harnesses: machine wash gentle cycle or hand wash. Air dry completely before storing. Do not put in the dryer.
Leather harnesses: wipe with damp cloth, condition with leather balm periodically. Never submerge or machine wash.
O-rings (metal): soap and water. Check for rust or rough edges. Replace if bent.
O-rings (silicone): soap and water. Replace if they stretch out or lose shape.