The survey, conducted on the National Headache Foundation's web site during December, included 182 people, mainly women aged 21 and older.
Nearly all participants -- 96% -- reported getting headaches from any cause. The same percentage said they're sexually active.
Among people reporting sex-related headaches, about 40% said they've cut back on their sexual activity because of their sex-related headaches, and only 12% said they've talked to a doctor about their sex-associated headaches.
That doesn't mean that sex is their only headache trigger. Among people who reported sex-related headaches, 42% reported having had no more than six of those headaches.
Not everyone got headaches from sex. In fact, 20% of participants noted sex eases their headaches and 6% report having sex more often for the headache relief.