It could be that I'm nearing 30, but I've gotten to the point that sex has become overrated for me. What's not overrated is seeing a girl and wanting to be able to see if you can conquer her by having sex with her. However, the actual sex part has started to be a drag for me tbh. I still get erections, but is there something wrong with me?
Nothing wrong, your taste is just a bit more refined. Novelty and a deeper purpose to the sex is what cures this imo. I had similar thoughts with an ex, and realized I simply didn't see a future with her. I see one with my current girl and the sex is better than ever.
You're right, sex alone is easy and not terribly interesting. I'll have a fling for fun if I'm in the mood to conquer, but the only way a girl will get regular sex from me is if I see a point in the continued time investment. And for that conquer fling I'll tease the piss out of her, because watching her lose her mind is fun and gets me in the mood to be more primal/objectifying, which is what she wants in that moment anyway.
Kink is a great avenue for novelty, the continued time investment goal doesn't have to be marriage and a family, it can be a rigging partner, a masochist I push over the edge, a slave, etc. It becomes more about the build up to penetration, and the terms of that penetration, which keeps things pretty fun imo.