How can girls make money selling themselves but guys can’t?

So I was having a random conversation with a mate down the pub how is is girls can make shit tons of money making porn videos on webcams etc and be snobby like “ ooh I’m worth so much I can get loads of views “ why doesn’t it work the same for guys ?? I mean I girl flashes her toys guys swarm if a guy flipped his cock out girls run away and he gets arrested??