Really?
"Rape n. 1. The crime of forcing a person (esp.a female) to submit to sexual intercourse. -- tr. v. 1. To force (a female) to submit to sexual intercourse." -- The American Heritage Dictionary
If desire for sex is, as you say, a biological imperative exempt from any ethical boundaries, then why shouldn't a man commit rape? In fact, according to your claims, I can't see where a man without a willing sexual partner would have any choice but to do so, since he is a slave to his hormones with no free will.