Sexy headaches.

In my never ending quest for sexy science - literally, I've found this "sexy" research reported on in Science Daily -

Contrary to the popular cliché, "Not tonight, I have a headache," new research suggests that not all headache sufferers avoid sexual activity. In fact, migraine sufferers reported higher levels of sexual desire than those with other types of headaches, according to researchers from Wake Forest University School of Medicine and colleagues.

Interesting explanation

The researchers hypothesized that abnormalities in the serotonin systems of migraine sufferers may influence their sexual desire. Because high levels of serotonin are associated with low sexual desire, and migraine sufferers have low levels of the chemical, it was predicted that they would report higher levels of sex drive.