1.Head and neck muscles often tighten during sexual activity, and blood pressure can increase at orgasm, causing blood vessels in the brain to dilate, a condition technically named coital cephalgia.

1.在性活动，和颈肌肉通常会收缩，而性高潮压会增高。这些情况会导致大脑扩张，在学术上这种情况被称为“<span class="key">性交性痛”。