Definitly need to wait @ 15min! Used it the first time and still came pretty quickly in my hot MILF's pussy but didn't wait long enough. The last time I used it we waited at least 15mins and I stayed hard for a long time. My wife was having orgasm after orgasm! It felt great for me too! I loved being able to fuck my wife like a porn star and when I finally did come my whole body was shaking. Good stuff...buy it!