Is it unique with humans

I think almost every part of our anatomy can be sensual in addition to its utilitarian function. Some guys are "boob men" while others are ass men. Some guys are a sucker for a woman with nice legs. Some like the womanly curves of hips and backs. Similarly, women might like a guys stomach, or arms, or ass.

I understand why some women say "I don't get it, they're just breasts. Every woman has them." But I also understand how many will reply with "Yeah, but they're also so much more!"

We're all a wonderful combination of things learned and innate, including what we find beautiful and sexy.