I'm looking for 2 old stories.

The first one was a guy who moved into a dorm or something of the sort, but it was filled with girls, so they forced him to get a vasectomy, but instead castrated him.

The second story is a guy and his sister going to some sort of museum or biology type event where he ends up having his sack cut open and then it ends. There never ended up being a part 2.

Any help would be much appreciated.