You know the saying of "Don't have sex with anyone crazier than yourself." Well, I've broken that rule twice. Both times the women seemed normal before and during ... It was afterwards I found out.
For instance, this one divorcee regaled me with a tale of how when she found her husband (at the time) cheated on her, she waited six months later and while they were both naked in bed and him asleep, she would keep pulling a hair out of his balls. He would wake up with a WTF? in an instant and grab his balls. She would turn over as though awakened by him from her sleep.
He would say, shit, it's like some weird pain going through my balls. She would start putting into his mind ideas about testicle cancer, prostrate cancer, or how she read about weird pains and men having to have their balls cut off.
Ok, so two things we learned from this. First, I dumped her not long after. (Trust me, it wasn't the only story she shared with me. Oh yeah, and she had a license for a gun and lots of buddies at the NYPD.)
The most important thing is, as said above, women know a level of cruelty, mind trips and evil that men would never conceive of nor even commit.