Possible explanations:
.
Butts evolutionary are where women would often store healthy fats that would help keep a fetus alive and mature.
.
They also contain some of the most powerful muscles in the body, which is an indication of health, strength, etc
.
They're also located quite close to the genitalia, and men tend to see them during sexual acts, so guilt by association
.
Even if they are were "poo" comes out, the anus would likely also be a decent indicator of digestive health, but I'm not going to get into the ways and whys of it
I don't have a foot fetish (maybe @nelson can answer), but if you take a look at a foot with thick causes, curled black toenails, warts, fungus, bleeding, etc it becomes pretty quickly apparently that 1) feet are a huge indicator of health and lifestyle and 2) keeping them healthy would have been a chore and a half typically.
.
It stands to reason people would find feet that were in good shape attractive on some level
No fetish as far as I can tell and I’ve been undercover trying to get a confession for a while, but yeah; healthy and clean, feet, socks and shoes tell you a lot about a persons grooming standards and habits
.
Butts evolutionary are where women would often store healthy fats that would help keep a fetus alive and mature.
.
They also contain some of the most powerful muscles in the body, which is an indication of health, strength, etc
.
They're also located quite close to the genitalia, and men tend to see them during sexual acts, so guilt by association
.
Even if they are were "poo" comes out, the anus would likely also be a decent indicator of digestive health, but I'm not going to get into the ways and whys of it
.
It stands to reason people would find feet that were in good shape attractive on some level