The other day, I went to my girlfriend's house for the first time. It was also the first day I had sex with her. However, it ended in failure. I was feeling down, so I decided to stay the night at her house. However, my room wasn't hers, but next to the couple's bedroom. I couldn't believe my ears. Her mother was whispering dirty words to her husband. And my penis, which hadn't been erect with her, started to get hard.