Well, I used to think like that too. Then I became slightly more spiritual, and the very idea of this sort of behavior is bothering, upsetting, irritating. But it mostly evokes pity. Like becoming aware of someone hurting him/herself in some way.

The way I see it, sex is a sort of portal to another world. This sounds a bit weird, but it really does and should have a great deal of meaning behind it, as it is/was central to our species. If it becomes mundane for someone, this really does ruin a lot of that person's life. Even if you completely remove the judgment element. If sex doesn't occur in the context of a love relationship, it's just uncanny territory. It comes with some emptiness.

There's a proper and healthy way to live. This is from my life experience. Stray too much off-course and you will experience consequences. It's just the way things are.