The straightest thing a straight man can do is having sex with a straight femboy. Its true, think about it. Women like men and liking men is gay thus making sex with women gay. However if you ♥♥♥♥ a straight femboy straight away you both don't like men thus it wouldn't be gay, right? Wrong. Let me explain.
You might think that because of the femboy being straight and not looking masculine, it wouldn't be gay to ♥♥♥♥ him but in reality the femboy would be gay because you look masculine. Having sex with a man is gay, so you would become gay too. So in order to have straight sex, you too have to become a femboy yourself. If there is no masculinity involved and you both are straight, you both stay straight during intercourse. It's that simple.