People with any kind of foot fetish are the dumbest imaginable, feet are no more sexual than elbows or ears yet there are people who would have them included in every porno I make you should see some of the requests I get on my pornhub channel, just thinking about it makes me cringe.
As for sunburns, I get burned every summer, not as bad as when I was a child and they don't last more than a few days before tanning. But even a few days of sunburn on my feet would be unacceptable for me, I run 15km a day and a sunburn on my feet would have me out of commission for about 3 days causing me to lose 45km of my weeks exercise