I will be 23 in less than a month and I have had 7 sexual partners including my husband, since being 16.
I have been with my husband for four years this April so 6 of them guys were in a two year stretch and I am no where ashamed of that number. However, I will say that I wish I wouldn't have slept with one of them, not cause I regret it, but because it really wasn't all that great lol. And because I was a rebound, he had just broken up with his GF the day before, however I thought he was super hot and I of course jumped at the opportunity!
I do regret not sleeping with one guy that dated before my husband. We had some problems in our relationship which ultimately ended it, but I now feel that some of those reasons could be because we never were intimate. While I love my husband to the end of this world and back, I would have liked to have seen where we ended up.