A blow up doll is a life-sized sex toy that is the shape and size of a human being. Blow up dolls are predominantly used as a masturbation aid by people with penises. In more recent years, sex dolls have become much more sophisticated and life-like, which has reduced demand for blow-up dolls. Blow up dolls are most often sold as novelties for bachelor parties.
Blow up dolls are also referred to as love dolls or sex dolls.