> Why? This statement seems quite a bit like you're passing a harsh judgement on people like me for preferring partners with a similar amount of sexual experience.

I think exactly because the question of experience seems so easily to carry judgment (in either direction, too few / too many). I don't see how my or their experience should change anything in our current relationship, so if they asked, I would assume some judgment such as you have. And sexual judgment would be incompatible with my values.

I don't even know if my partner had long term relationships before me -- I suspect yes, and I assume they haven't been married. But I don't care about those facts either.