I lost my virginity at 15 to a girl I had known my entire life. Since then I have been with quite a few sexual partners. Altogether, probably about 15. I played it safe, used protection, checked myself to the clinic once a year, and have always been clean of std's.
My girlfriend, lost her virginity 2 years ago, and has been with 2 guys and myself.
She is very insecure about the fact that I have had *way* more experience than her, but honestly...Those guys she slept with, probably gets to me just as much as mine get to her.
It's not a topic we get onto very often, cause she starts to feel bad about it. But numbers really mean nothing. Provided you're both clean, and playing it safe, and genuinely care for one another, don't let numbers get between you.
The days of chastity are almost dead, and where I come from, virginity means "not pregnant yet". Luckily I had an open minded mother who made sure I was well informed and smart about sex.
If it truly affects you, the best medicine is conversation. But remember, you can't change who your partners *were* and to beat yourself up over a time in their life when you weren't part of it, is not healthy for your relationship.