Biology Homework

Okay, we were having a free-day type thing in biology one day. For our homework we had to compare another word or something to a biology term. So I chose parasitism, and i compared it with rape...

This is what i put:
"Parasitism, a symbiotic relationship between organisms of different species where one organism benefits at the expense of the host. As of Rape, one person in the relationship gets pleasure while the other one is expensively stripped from his/her's personal virginity, or personal concept of displeasure."

The teach was mad, but he let me redo it with appropriate terms.