Women have used this line as an excuse to avoid sex. Men make light of the line. But, is there really a relationship between headaches and reduced sexual drive? Some researchers think so.
One study conducted at the Illinois Institute of Technology suggests that migraines and sexual desire appear to be modulated by serotonin levels in the patients. Reportedly, migraine sufferers have chronically low levels of serotonin. On the other hand, some women reported relief from a migraine attack after having sex.
A summary of the study: http://www.medscape.com/viewarticle/533713
What is your experience?