According to the National Headache Foundation, for some people, sex with orgasm can cause two kinds of headaches:
Coital cephalalgia: This exertional headache occurs during sex. It develops when the blood vessels of the brain dilate and the muscles of the head and neck contract as a result of building anticipation in preparation for orgasm. This headache is usually benign and rarely associated with a serious health problem. Taking a non-steroidal anti-inflammatory drug (NSAID), such as aspirin or ibuprofen, could help relieve the pain of an exertional headache. However, see a health care provider if you also experience any of the following symptoms along with this type of headache, or if this head pain occurs more often than once in a while, because it could indicate a serious problem that needs to be looked at right away:
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