My girlfriend [F] at college

My (m22) and girlfriend (f22) started dating just before we left college. We were both single for the majority of the time we were there, this means I know a lot about her past with my friends.
– when she first got to college she was a virgin, so for the first couple of months she would only give her one night stands head. I know this because two of my close friends received blowjobs from her. I got all the details the morning after, how she made gagging sounds and swallowed them afterwards.
– She also lost her virginity to one of my friends. He told me how he had to go slow and teach her the ropes. I find it so hot that she had this experience with someone I am still very close to.
– over the time at college, she slept with another two of my friends. Who from their stories it seems my girlfriend became a lot more confident in the bedroom from the time she lost her virginity. They both said how she loved doggy, and didn’t care about condoms. Both of them finished in her.
– the hottest aspect of this is how one of my friends told me that she had this sexy black g string when they fucked. Well the second time we slept together, I noticed she was wearing a black g string that matched my friends story. The thought of it being the same one that she wore with him was amazing. That she slid it back on after my friend finished in her. Safe to say I didn’t last long after that.