You don’t think having let’s say thousands of sexual partners is an unhealthy behavior?

I am not passing judgement, I am saying it’s probably not very wise.

Unless you have an orgy each weekend, thousands migjt be a tad difficult to achieve. If you do so, well, I don't see why it would be a problem per se, no. Or we talk about sex workers, in which case again, I don't see why it should be a problem.

No idea where this fear of STDs is coming from, condoms do exist...

Condoms aren’t super effective. 0.9^N success rates.