Sex with your partner can be incredibly fulfilling. It can be loving and long, rough and quick, and anything in between. Unfortunately, the euphoria can quickly fade when you notice your vagina becomes sore in the minutes after. You might wonder what exactly happens and why your vagina sore after sex? Luckily, there is an answer. Sure, you probably already know that being dry during sex can make you uncomfortable, but it can actually be the reason for post-sex discomfort too.