I read about that one and it definitely sounds like that's it. There is a sex/rape/breaking limbs scene in it.
In I was a teenage zombie
There is deffinetly the two scenes OP mentioned. However I can tell it was a he-said she-said, because in the actual film a zombie enemy rapes another guys girlfriend on the hood of a car in the woods and snaps her legs up, like a split gone too extreme, killing her. And Towards the end, the friendly main character zombie guy is in the school basketball court for some of the more important scenes featured at the end. I am prettyyyy sure this is the movie mentioned by OP.
I was a teenage zombie is for people who like bad movies, and in that respect, it shines. No disrespect intended, I actually liked this movie a lot lol. It's terribly made, with terrible sound, and bad production values. Yet at the same time, it's a likeable very low budget look at the 80s. The soundtrack was the high point. The actors looked like they were all having a blast. The gore effects were entertaining but brief. The plot doesn't really start until 80 minutes in, which is hilarious. Overall in my books, this is a likeable piece of mold.