I think she's asking if a persons sexual preferance matters when being forced into a sexaul act counts.  Like if a person is homosexual would they even get an arousal when a person from the opposite sex tries to hit on them (or more in certain cases.)  Bi-sexuals would most like be screw no matter what (Excuse the pun), but this is a valid point.  Someone who has a "thing" for elves would have a harder time resisting elven advances.  How would that play in the game?