Spliff
Godzilla got busy.
True, but Tyrion THOUGHT she was and married her anyway. On the flip side, though, she truly loved him. So...1/2 a point on the simp scale.
No, she was the a victim of a brutal gang rape. Whoring is a profession. (Although you can certainly rape a whore.)
I don't know why they didn't reveal Tysha's entire story in the books, especially the part when Tyrion was the last to rape her. He feels so much guilt after being able to get hard despite what he just witnessed. And he spends the rest of his life wandering from brothel to brothel trying to find her because when Tyrion asked what did Tywin do to her when he was all over, he said that Tysha went "wherever whores go". That's when Tyrion shot him. It had nothing to do with Shae (who did not love Tyrion at all.) It would have given a lot more depth to Tyrion's tendency to go for whores.
Also Tyrion didn't kill Shae in self-defense - he straight up murdered her. And while he didn't try to rape Sansa (who I think was about 12-13 at the marriage, not 14), he sure as hell tried to fukk her. They did quite a bit, IMO, to make Tyrion more likable as a fan favorite.
This explains his actions and motives so much.