“Not tonight dear. I have a headache.”
Researchers have found that not only can headaches prevent sex, sex can create headaches in some people. You may notice a dull ache in your head and neck that builds up as sexual excitement increases. Or, more commonly, you may experience a sudden, severe headache just before or during orgasm.
For more details about this problem that affects about 1 in 1,000 people, visit this page at the Mayo Clinic website.