Bi, OK for women but not men

I'm a marred man, and a few years back my wife opend up that she like to watch bi men. She asked me if she could watch a man giving me oral. It took some time for us to come across a man that we liked. I did enjoy it and afture he was done, my wife was on fire. So why is it that most peaple are OK being around a bi female and not a bi male. I do not want, or think of having sex with ever guy that we meet. I must admit that I do look at other women and my wife at men, but we do not seek out others for bed play.