For the purposes of Adult Video, "Bisexual" almost always refers to men having sex with men and/or women at the same time. Although, it is often women who engage in same sex scenes. Bisexual videos usually feature MMF threesomes and at least one scene with Bisexual men.
Sometimes mainstream male porn stars will participate in a Bisexual movie within hetero roles. More often though, mainstream female porn stars will lend their names to Bisexual productions. For the Best in this genre, check our Adult Video section - Bisexual Best Sellers linked below.