Any thoughts? Why yes, thank you for asking.
Society is fucked up and sexist, and men are rewarded by being considered more masculine if they fuck more women, while the women who fuck those men are derided as sluts - and the more men those women fuck, the sluttier they are.
Meanwhile, men who have sex with many men have all kinds of negative things said and thought about them - and women who don't put out are cold bitches.
Certainly there are caveats and exceptions to all that, but when you burrow down to the crass, cynical heart of western gender norms, it's all there.