In the context of BDSM, forced heterosexuality refers to play (or a "scene") in which the submissive partner is forced, by the dominant partner, to participate in sexual activity with a member of the opposite gender.
It is important to understand, in light of the presence of the word "forced" in this term, that prior to any play a dominant and a submissive should negotiate what play they will be participating in. In these negotiations the submissive partner would consent to being "forced" to engage in forced heterosexuality.
