For a woman, a strap-on can be used to anally penetrate a man (pegging), for vaginal or anal lesbian intercourse, or for artificial fellatio. For a man, a strap-on can be worn for penetrative sex, and may be used in cases of erectile dysfunction, for double penetration, or to penetrate multiple partners. A wide variety of harnesses and dildos are available, with different ways of fitting the wearer, attaching the dildos, stimulating the wearer or the receiver, and all with different features, advantages, and drawbacks for both users.