I doubt the majority of people on this site really care if you're a guy playing a female character, a woman playing a male character, nonbinary playing a gendered character, etc. I know I don't, personally speaking.

Though I will say, since you brought up that how you've hardly found anyone wanting MxM, that FxM is definitely the most popular here in RPG's 1x1 section. That's not to say there aren't people looking for MxM RPs, but it might be why you're not having as much as luck as you would prefer finding a potential partner to RP with.