In 2009, psychiatrist Richard Friedman tested his theory that the post-sex blues was just the amygdala, which normally masks fear and anxiety during sex, creating a temporary depression when the levels return to normal after the deed.

Why do I feel guilty after ejaculating?

People with vaginas who feel nauseated after penetrative sex may experience an episode of vasovagal syncope. This could occur when your partner penetrates very deeply, hitting your cervix. Your cervix has lots of nerve endings that can trigger a vasovagal response.

Why do guys get sad after they bust?

He wanted to prove that the phenomenon was, in some cases, the result of a rebound in the amygdala—the part of the brain that deals with fear and anxiety. During sex, the amygdala dampens fear and anxiety. Thus, post-coital sadness could be explained as amygdala function sharply returning to normal levels.