Scientists fed female lemurs birth control pills, and discovered that it distorted their scent to the point that males were no longer interested in having sex with them. We get this little tidbit about the study, from Science News:

Working with 12 adult female ring-tailed lemurs at the Duke Lemur Center, [biologist Christine Drea] and her colleagues studied female genital odors by analyzing secretions chemically and observing animals' sniffing behaviors. The researchers collected scents from females both before and after giving the animals a form of the hormone progestin called medroxyprogesterone acetate, or MPA, sold as Depo-Provera. Details of the study were published online July 28 in the Proceedings of the Royal Society B.

Apparently, according to one scientist not involved in the study, this has consequences for humans too:

As for people, men and women might not think they're influenced by each others' scents, but "Oh, we are!" said behavioral biologist Susan Jenks of the Sage Colleges in Troy, N.Y., after Drea's presentation. If women react to the hormones the way lemurs do, "maybe you don't want to be on contraceptives when you're picking your mate."

Oh, good plan! Don't use birth control when looking for a mate. Thanks for the uninformed editorializing, Dr. What The Hell Were You Thinking.

via Live Science. Read the scientific paper here.