Why do girls make noises when they have sex?

First, I took the initiative. I dreamed of finding that kind of happy feeling. I finally got it. I can't stand it. I naturally called it out, which is what people often say. Nice voice, it will be loud.

Second, I am passive. I don't want to do that, or I couldn't stand the recovery of my mind from the beginning and was in a hurry to stop. But this pleasure is imposed, and I can't stop it. I can only helplessly let the pleasure cross the threshold. The feeling at this time is very complicated, which can only be described by a neutral word: groaning, girls will also make sounds.