A person's body count is the business of their potential partner, why do people think it's not?

If I didn't sleep with a bunch of people, I have every right to know if my potential partner has the same standard and values as me. (And no, it's not insecurities so don't even go there, it's about personal values)
A person's body count is the business of their potential partner, why do people think it's not?
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