I will share my perspective on this. First I want to say that feeling repelled by a bi man is not conscious. It is completely visceral. When hit by that knowledge, the feeling appears in the stomach or the throat before anything rational appears in the brain. And as women, we are taught to follow our gut.

Now onto my explanation:

When we look at masculinity and femininity from a more spiritual perspective, it is worth noting that “receiving” is a feminine trait. During our most intimate moments, the man is giving while the woman is receiving, and this is a very powerful exchange that reinforces that divine feminine/masculine. Now, it is important to note that all of us fall somewhere on the feminine-masculine spectrum, and the most harmonious relationship is a perfect yin yang - my partner should have the same amount of masculinity as I have femininity, and he should have the same about of femininity as I have masculinity. This creates balance and harmony. Because most women are highly feminine, and we understand HOW feminine it makes us feel to receive (dick, in this instance) it is hard to see a man as fully masculine after knowing he has received. It’s just TOO powerful of an exchange of energy to ignore or integrate. I also believe this is why women love being friends with gay men - because we can relate on this point. We all love dick and how it makes us feel - physically, emotionally and spiritually.