lol I don't quite remember how long it lasted but it was when I was going in to year 7 (first year of big kids school lol) and it wasn't serious. First sexual relationship well, I don't know if it counts but I lost my virginity at 14 which was a one off with the girl I had been with for 6 months. The first "regular" sexual or serious relationship I count I was 16 for and it lasted about 2 - 3 months. First really serious relationship started 2 years ago and I'm still in it.