I may be biased because I see nothing wrong with safely-played promiscuity when not in a monogamous relationship. I think these bodies are fun: enjoy it. Some like it, others don't. Some judge it, others won't. We are who we are.
But this seems to be not just an issue of so-called moral judgment levied against promiscuity, but particularly an issue of dating a person or of dating that person's past.
You say you wouldn't be comfortable with a guy because of who he slept with , in his past, so let me bring that home for you.
I knew a guy who wouldn't sleep with a guy, not based on how many guys that guy previously slept with but by the color of the guys he might have slept with such that if he knew that guy ever had sex with a black guy, he wouldn't have sex with him.
Now you're going to argue that the one hand has to do with a person's behavior while the other has to do with a person's skin. But from the point of view of the guy making that ultimate judgment, it was the behavior of the person who slept with that skin which he's judging. So then this case is a matter of behavior v behavior with regard to that sort of judgement.
I've already buried two 10-year partners and when I meet someone new and they ask of my past and I tell them do you think that doesn't make them a little concerned? And that had nothing to do with my behavior. I didn't know life was going to take them from me so soon. You think new guys won't judge me based upon that? Should I lie about my past so I don't make them nervous? Should I change the color of the guys I had sex with? Should I deny their number?
Oh if only I could find a white virgin with no past who never dies, I'd be so happy....