Moisturizer ... :)
I know you're obviously talking about "skin" but be prepared for a few not terribly clever jokes from some of the men here. :-)
Lightly tanned, shredded mercilessly in a few places.
I always use sunscreen when the situation calls for it. Sunburns are unpleasant!
Good nutrition, plenty of water and avoid excessive sun exposure. Pretty basic.
I keep the pipes clean.
Keep it clean and avoid too much sun.
I don't, I leave that to my girlfriend ;)
Sometimes I do drink a glass of water to surprise him :p
eat good food,exercise,avoid eating oily food