Women don't go around complaining about blue balls like men do. But that doesn't mean it can't happen to them. As this hilarious explains, women can also experience the uncomfortable pain after prolonged horniness. But maybe we should call it blue vulva instead of blue balls (you're welcome for that image).
Epididymal hypertension (translation: blue balls) happens when fluid and blood builds up in the testicles and genitals. Blood swells down there for ladies too—it just happens in their vulva, uterus, or ovaries. The good news is both blue balls and blue vulva won't harm your health or ability to have sex (another reason why you should never pressure your partner for more!). If you're looking to relieve the pain, masturbation, waiting it out, or using a hot or cold compress can help.