He has a point, but its incomplete. Reproductive drive is a subset of Sex drive. Why do homos get turned on by same gender? Not to reproduce for sure, but to get their rocks off. Why do some people get turned on by animals? Not to produce some hybrid animal, but to get their rocks off. Why do some people get turned on by children? Reproduction? I doubt it. Why do some people get aroused by inanimate objects (eg. dolls, mannequins)? Not to make babies I'm sure. The human mind is far more complex and cannot be explained by just simple "basic" stuff. I hear some people get aroused by violent scenes too!
Cheers!