I'm not bragging.... not the intent. I apologize. In all reality, most are forgettable and would much rather have had more meaningful deeper relationships. But, many guys do have more sex than they'll tell you... do a little math. If a male with a typical sex drive, goes out at least once a day on a weekend, he is likely get laid than a male who stays home and plays video games. If such a male does this 4 times a month (skips a weekend / parties Fri & Sat), gets "lucky" half the time, that would be at least 25 sexual partners a year. X 5 years = 125? You can ask "how many" to a guy who is 18 or so... but to a man who is 30 or 40 - that is not a religious "not until marriage" type, he's lost count or has a vague number.
I don't go out much anymore. But I've talked with so many people - friends and strangers... and this "what if he finds out he had sex with XYZ" just doesn't come up... its rare, even among kinky fuckers. Mature people don't give a shit. Out of all my life, only one adult I can think of that tells the world who he banged, and he's very immature... he's like a 38yr old kid. You hang out with a group of people, chances are - you're going to have sex with someone who had sex with someone you know.
You had casual sex with Kingbee a few times... and you want more of him in a serious way. Great, go on new dates - doing things that are fun, that doesn't involve drinking or drugs then sex.
You cannot control if that friend or brother tells him "I shagged her". And if you talk to them about it, you have chance perking their interests to tell him or blackmail.
You weren't with Kingbee for a long time (years? Months?) and therefore, you are not his dictate WHAT you did with WHO... right? If you were married to him and had sex with those guys behind his back, then there are SERIOUS issues.
If its been more than several months you had sex with those guys, would they really have anything to tell him about you that would matter other than "a shag"?
I'm trying to picture naked, the previous woman I was in love with and two GF relationships... I pretty much don't know what they look like naked. Other than "nice", enjoyed what I saw and had a good time. I would need photos.
If you and Kingbee get serious, etc - and those guys come up to him and tell tales. He's either going to be upset with them or with you. Them = "why bother me with this crap? Trying to make me jealous" or you "slut! How could you?!"
Which do you think is more likely?
As you stated, you stand by your decisions to have casual sex... then do so. I have sisters, I have female friends, and my wife and her friends - I feel that women talk about sexual details and sex gossip for more than guys. Hell, even my gay friends talk less about sexual life than women.
So, if Kingbee ever brings it up, then you balance it out... he's not a virgin either.
I support women's right to their bodies and their sexuality.