So my friend taught me about the strangest term of all time that shows up in the Gemara, namely mukas etz (which refers to a girl who has a ruptured hymen.) Literally it means that she was injured with a stick and that's how that happened.
Now, my problem is that I have no idea where that term first appears (it seems to be all over Kesuvos) and I want to learn more about it. For instance:
1. Does this only apply when she was literally injured by a stick or is it a term used everywhere for accidental loss of hymen not-through-relations? (It seems not to only be this specific case because there's the argument about the nine-year-old sleeping with the girl and how, since he's a minor, maybe it's mukas etz for her.)
2. Does it have to be accidental? If a girl deliberately manages to rupture the hymen (think the phallic idol-worship scene with wood in that horrible book The Red Tent), is she still mukas etz or is there a different term for that?
Anyway, where should I look to research this further? Thank you!