There are always exceptions so I don't fee the need to explicitly call that out. But I do submit that it's more like most than many.

Can you clarify how your second paragraph is connected to the first?

You start with the mental model of sexuality of three seperate and distinct groups - straight, bi, and gay. You then use that mental model to make a statement "any straight guy will avoid". But because your mental model is wrong that statement is also wrong.

You have absolutely nothing to support your statement apart from your own gut feeling.

Oh right. The whole everyone is a little bit gay thing.