Double Ended Dildos, offering hands-free play options and enabling a variety of creative positions. Their toys are all annealed borosilicate glass, which is as strong and durable as you can get in a glass sex toy.
Another method for strap-on sex that is, oxymoronically, not mounted at all, is the strapless strap-on. These dildos have a bulbous extension that inserts vaginally into the wearer so they can experience their own penetrative pleasure while penetrating their partner. These dildos have no base, with a head on either side, for two partners to penetrate at once for a more intimate experience.