Do KW research and see if it's something worth promoting, then if the content isn't really there in terms of paysites, sign up to sites that might have a couple of scenes/promos with both m/f being muscular then promote those all in one general blog or tube (Probably not enough content for a tube, though)
Same with most niches/micro niches, do research and see if it's worth it first, though. And if you really have to and think the market is there, shoot the content yourself.
But I do agree with above about why it's mostly smaller guys.
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