A strap, or strap-on dildo, is a toy that is strapped on to emulate the male penis. A strap on is attached with a belt or harness and is designed to sit in a similar position as the male penis. It fits around the waist, thighs or both. The dildo on the front of the harness can be used for vaginal or anal sex.
Strap ons are typically worn by women, but they can also be used by men who experience impotence or erectile dysfunction and can be used in the same manner as the penis for sexual activity. For the wearer's partner, sex with a strap on closely mirrors sex with a penis.