A strap-on
dildo (also strap-on, dildo harness) is a dildo designed
to be worn (usually in a harness) by one partner and
used to penetrate another partner vaginally, anally
or orally, used by both heterosexual and homosexual
couples.
For a woman, a strap-on can be used to anally penetrate
a man (pegging), or used vaginally, anally, or orally
for lesbian intercourse.
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.