I know regretting most of my sexual encounters is not something a sex-positive feminist who used to write a column for Playboy is supposed to admit. And for years, I didn’t. Let me be clear, being a “slut” and sleeping with a lot of men is not the only behavior I regret. Even more damaging was what I told myself in order to justify the fact that I was disposable to these men: I told myself I didn’t care. I didn’t care when a man ghosted me. I didn’t care when he left in the middle of the night or...