I don't think anyone is forced to wear a top right now. I see lots of women at the beach with their tops unhooked so they don't have the tan lines. Blacks Beach in San Diego is a nude beach, I went there once, you would wish more of them had their suits on if you saw them.
This depends upon where you are, state laws, city ordinances ect. I find it unfair to have one set of laws for men, and a different set for women. Now, if a man is modest and chooses to wear a T-shirt to the beach; that's fine. By the same token, if he chooses to take the T-shirt off because it's really hot, he's fine. But if a woman does exactly the same thing, she goes to jail. That is unfair.
If we twist the situation around a bit; if a man went bottom-less; he would be arrested for indecent exposure, and he should be. If a woman does exactly the same thing, she would be arrested for the same charge; and both should be fined the same amount. That is fair.
If women are fined for going topless; then men should be fined for wearing dress socks and shoes with bermuda shorts at the beach.