The waist restraint is an excellet option. This device makes being in the doggy style machine more restrictive. Its has various height levels to ensure that their ass is the right position.
the waist bar is awsome.My friend has one and he loves it to.We both love using the waist bar with each othger and also the Doggy Style Fuck Machine on each other.We both can get off with out touching our cocks.Its awsome