The funny thing is when the "shoe is on the other foot." It's all fun and games when rejecting and break the hearts of guys at will, and claiming how all these guys are not good enough or meet her standards. But suddenly the world has wronged them, when she finds out that he sees her as not good enough to be the girlfriend or wife, but good enough to fuck.
A lot of FWB, beside going after bad boys and adventure, is the woman trying to trap a guy out of her league with vagina. She's a bit chubby, older, poorer, less popular, not of that social class, etc... There's a saying that 80% of woman seek to be with just 20%. A lot of women knowingly and unknowingly fucking the same guy(s). Thinking she playing him or beating the system, but he's playing her, they are playing each other, or father time beating them both.