This week's book, because I spent the book budget on a pair of computer games, and this one is a gift from my father:

Mathematics and Sex by Clio Cresswell

Book Description (from Amazon.com):
Mathematics and sex may make odd bedfellows, but this fun, flirty look at the relationship between the two subjects shows that they are closely related. Revealing the ways in which math can help unlock the secrets of love, lust, and life's search for the ideal partner, this intriguing text covers topics such as dating services, dating as game theory, the mathematical logic of affairs, and the numbers behind orgasms. Math's answers to love's burning questions How much should one compromise in a relationship? Exactly what is it that is attractive in a lover? How many partners should one have before settling down? and What makes the infamous biological clock tick? are also revealed.

I'm kinda curious...