This happened when I was around 18, I am now 31 so I don’t remember every single detail of this situation but I will do my best.
Like I said this happened when I was 18 and the girl I was dating at the time was 17. We were at my house alone one day laying in my bed watching a movie. she and I had been dating for awhile and we had sex anytime we had the chance. I was super horny as most guys are at that age, so I turned to her and kissed her. I started to move down and kiss her neck, chest, and down to her stomach. She knew what time it was and as I attempted to undo her button on her jeans she reached down and pulled my face back up to her face and said “I can’t right now, its that time of the month”.