@Tialou,
So, let me get this straight: your current boyfriend is not your first lover, you've had several others before him, right?
Why do you feel the need to compete with your boyfriend to encounter in casual sex?
You seem to have low self esteem and encouraging casual sex will not satisfy you, on the contrary. It's a fatal cocktail that will leave a major hangover.
Who cares what your partner or yourself did before you met - your life with him starts the day you got together. Forget everything that happened prior, it
should not be a concern of yours.
Consider yourself lucky that you have found someone you're compatible with and you love. As for casual sex - go and see "Looking for Mr. Goodbar" .