we all have our own boundaries, but, sheesh, it's hardly 'slavery' to do something caring for a loved one. Perhaps he actually likes that little bit of practical pampering? Some men like the feeling they're being 'taken care of' by their wife. It's a nurturing thing for them.
I cut my hubby's nails every two weeks, I rub oil in the cuticles, use a little hoof stick, give him a full manicure session. If he does it himself, one hand will invariably be wonky. I'm dying to get my hands on his feet and sort his toes out, but he won't let me: doesn't like his feet being touched.
he does the same for me: if I asked him to do my toes, he'd give it a good go. (I like having a full compliment of toes, though, so wouldn't ask). I often have a sore neck/stiff shoulders, and he'll give me a good kneading when I ask him to, even if he's tired.
some people though, even though they have feet of their own, have been conditioned to see feet as vile, smelly things, I suppose...