LOL, maybe you're right, it may be a turn on, but I think that it is just for the fun part.
Yes, women are more afraid of bisexual men, I have a friend that once told me she would be devastated if her boyfriend left her for a man because she would assume that it would be because of her! She is incredibly feminine and beautiful so it really seems silly to listen someone saying that when she is such a perfect woman, but I made the question to other friends and they all thought the same. Even so, most women when love don't let go easily, at least that's the impression I have.
I figured out I was gay because my best friend, when I was 18, started having feelings for me, and I realized that something was happening there and that I also had really strong feelings for him, well a few months later e left me for a girl, he was such a sweet guy and tried to keep being friends but, naturally, that was just impossible for me... So you see the problem, I feel it was the first and last bi guy for me, even if I could consider someone else if it is someone worthy of my trust but, even so! There are stories like this one everywhere, if you want a serious commitment the perspective that it may happen is really scary! But well if it is just for fun, bring them on! LOL