Susie loves science, so today she brings you the real reason why women menstruate every month. It's not so women can have babies; it's all about self-defense when they get pregnant. What? Seems like evolution has created a maternal-fetal conflict. All the bloating, discomfort, and raging hormones are the result of nature making women ready to deal with the chance of motherhood and the real possibility that a baby will challenge a mom's status quo.

Next, in our ongoing “Tell Me Your Sex Story” segment (our interviews in which you hear from people just like you), we meet another listener who has stepped into Susie's sexual confession booth to bare all. This week, Susie talks with "Julian", a man from the Midwest who talks about sex before and after sobriety. Susie and Julian discuss amazing anal sex, dating a much younger woman, and how drunk, sloppy sex isn't necessarily a turn on.

Then in our "Try This at Home" mailbag, Susie reads a disturbing letter. Our listener writes: "My boyfriend mauled my g-spot so bad I can't have intercourse anymore." Susie is outraged and has some kind advice for our bruised and uncomfortable girlfriend.

Have a question? You can call Susie's hotline at 831-480-5110. And you can send your confidential questions - plus requests for free samples and blog banners! - to susie@susiebright.com. [Episode 508, January 13, 2012]