 Representations of bisexual eroticism have been found in ancient Etruscan tomb paintings that feature homosexual activity combined with heterosexual activity.Bisexual pornography began to develop as a genre in the 1980s.While bisexual content featuring lesbianism had been prevalent during the 1960s and 1970s, bisexual content featuring male homosexuality was first introduced by major pornographic studios in the early 1980s.