See im probably just a typical straight bloke, but i can understand a woman being bi, but not a bloke. I can understand a woman finding another woman attractive even if she is actually straight(mainly lol) but not a man who is straight finding another man attractive.
Most people i speak to are in that frame of mind too INCLUDING women. Most men find seeing two women sexually together a major turn on, but how many women do you know like to watch a bloke getting his end brown?