If my hypothetical daughter wanted to fuck 50 dudes in 4 years, I'd be damn proud. And hope that I provided ample knowledge about the risk of sex, the tools to mitigate those risks, and the empowerment to enjoy herself free of guilt from everyone else's bullshit opinions.
I don't think it's empowering for either gender. It's sex gluttony, it's not automatically a good thing just because we've decided sex should no longer be a source of shame.
How many partners per year does it take to go from "normal" to "sex glutton"? It's is even partner specific? What about having sex with only one person, but doing it 4 times in a typical day? Is that enough sex to be "sex gluttony"?
Honestly, it sounds like a bullshit term made up to shame other people for an unspecified rate of sexual encounters that you can't personally achieve.