I also think that repetition compulsion, for those who were sexually traumatized, can lead to confusion about one's true sexual orientation.

This is a psychological phenomenon where people feel compelled to re-enact a traumatic event, in a subconscious effort to resolve it-- to diffuse it; rob it of its power over them. It's especially common in response to having been raped.

So, if a straight man or lesbian is sexually assaulted by a male, they might compulsively seek out sex with men, and therefore conclude that they're bi... despite being, in reality, exclusively female-attracted. Because, for them, sex with men ISN'T about attraction; it's about something else: trying to gain control over an experience which haunts them.

Of course, while they need to resolve the trauma, this has to happen in a safe setting (like therapy)-- doing it this way simply re-traumatizes them.