This question was raised on a rap forum a couple of years ago:
Is it gay if you sing along to the women parts of Doin It Well by LL Cool J?
I mean it's a rap classic.
I mean the lyrics are very seductive towards men, so I wouldn't expect a straight guy to sing it. I wouldn't say it makes them gay though, it's just lyrics to a bop. Straight guys are too insecure to sing that part anyways.