I’m doing a thing in school on how animals have sex and whether it is for pleasure/likewise or only for reproduction.
I also write about why they do as they do, what’s the profit of doing it that way and so on..
I’ve already written a bit about spiders, where the female eats the male, and some about monkeys(not done there though), they have sex for pleasure and as a conflict resolution. I’m supposed to write about mice too, they give the female a sort of chastity belt by sealing the vagina with sperm.
Most of all I need more sources since I’ve only used one, a very good one, and my teacher wont accept just one source.

I’m from Sweden so I apologize for my bad English. Can’t write but I do understand so sources in English are no problem!

Thanks in advance!