Being bi or gay was taken off the medical books a long time ago as being a mental health issue, ie psychological.

Interestingly, the latest research shows that you are not born with bigotry - you learn it or it occurs in your own mind often based on ignorance or fear ei psychological - and that homophobia is most prevalent in closeted gay males!

Harvard study on homophobia in males will give you the gist.

There is no evidence at all that being bi or gay is psychological in origin no more than being straight is. It occurs quite naturally and, most likely, is hard wired before we are born. Thus, it has an organic origin albeit the wiring is in the brain.