I'm not trying to speak for any of those who indicated they might be attracted to men, but here's how I read that.
While I have no doubt that there are those who are exactly that way, (kind of a "I only smoke when I drink" thing), I suspect that for most it's just an admission of a harmless titalating fantasy, not something inextricably wired into their psyche.
Hey! Gives me an idea for a new thread!