Study links migraine headaches, sex drive: "Contrary to the clich,, "Not tonight, I have a headache," a study has found that not all headache sufferers avoid sex: in fact, migraine sufferers report higher levels of sexual desire than people with other types of headaches. Migraine is a type of severe, recurring headache. "Sexual desire and migraine headaches may be influenced by the same brain chemical," said Timothy Houle of Wake Forest University School of Medicine in Winston-Salem, N.C., lead author of the study. The research, which involved 68 young adults from Chicago, is to appear in an upcoming issue of the research journal Headache. "Understanding of this link will help us to better understand the nature of migraine and perhaps lead to improved treatment," he added. Evidence suggests a complex relationship between sexual activity and headache, the researchers said. Both have been linked to levels of serotonin, a brain chemical that also plays a role in depression. Excess serotonin may be associated with decreased libido, and migraine sufferers are reported to have low levels of the brain chemical in their systems. Serotonin has also been found to play a role in migraine attacks.