You've hit the nail on the head. While I understand where the prevailing sentiment comes from, I've never understood the logic behind it. Like any other function of our bodies that is intrinsically part of our make-up, the idea of that this should be something to be embarrassed or closed off about seems ludicrous. I also tend to think that the very act of closing off that subject is what leads to many of the atrocities and health issues that happen surrounding sex. It's an infantile, control ridden approach at best.

I also agree with OP about marital jealousy. Finding what intrigues my partner is enjoyable to me. Her desires are a feature, not a bug, and shouldn't be viewed as aberrant.