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Gay men are generally in better shape than their straight counterparts because of a biological truth, which I'll try to explain very briefly.
Gay men and straight women spend more time on their appearance than straight men, because men are biologically predetermined to seek out a mate their physically attracted to.
This is why, if you went to a gay bar and looked around you would see a freakishly high number of what is called 'gym bunnies'.
Of course, not all gay men have bodies like Ronaldo, but significantly more of them do, when compared to straight men.
This means that straight guys with average physiques need never worry about having their 'backs to the wall', because there's sufficient gay men who are far more attractive, to go round.