>!TL;DR (Spoiler) – my gf lost her virginity in a threesome with her best friend, and her friend’s boyfriend.!<
We’ve been together for 7 years now and the start we both agreed not to bring up details of our past (beyond the basics like number of serious relationships, how long etc…). I’ve been in relationships in the past where I have found out more than I had bargained for and it ended up bringing out some insecurities, so I was quite happy to leave it at that. As time has gone on I’ve matured a lot and now feel really secure with my gf but up until the last year or so still never knew that much about her past and never really had the inclination to bring it up.