As we have progressed as a society, awareness and acceptance of many different sexualities has grown. However, there are still those who do not understand that sexuality is fluid and not as black and white as straight and gay. Straight women are free, even sometimes encouraged, to experiment. Straight women will afford their male partners with threesomes and kiss or sleep with their friends and will still be able to identify as straight. Their sexuality is never called into question, they aren't called a lesbian or bisexual. If they admit to relations with a woman but then figure out it was not for them and that they were indeed straight. No one questions them, and they are essentially "allowed" to still be straight.
Straight men are unfortunately not afforded the same understanding. Some people seem to only understand experimentation when it feeds their sexual fantasies, and those fantasies ultimately stem from homophobia. Once a straight man admits to having relations with another man just to see if he would like it, he is automatically labeled as gay. No ifs, ands or buts about it. Even if he also reveals that it turns out he is not attracted to men, he does not get to come back from it. He is now seen as gay from then on out.
Due to how men are socialized, they are taught to be overly worried about their masculinity. So when they are called gay when they know they are not, it is basically the end of the world to him since men are taught that gay means he is feminine, less than a man. Men just are not allowed to be comfortable in and explore their sexuality and this double standard in our society is truly ridiculous. Men should be allowed room to explore their attraction without fear of judgment or ridicule.