By “fair skin” I mean skin that is light enough to sunburn after spending just a short amount of time (less than an hour) outside.
I was going to ask a question in GQ, but then I thought of something that might possibly account for what I’ve observed, so I thought I’d do a poll to test that hypothosis first.
For polling purposes I’d like to know:
a. If you usually use sunscreen on your face during the sunniest months where you live.
b. Your gender
I am the palest person I know. I usually avoid the sun any way possible, but I also use a product with sunscreen, year round. Female.
I use a moisturizer with sunscreen year round and am naturally very pale and easily sunburned. I’m female.
I practically glow in the dark. I wear SPF45 to sit in a closet at midnight. Female & I live in So. Cal. 
*
*(that’s me with no sunscreen)
I use a lightly tinted sunscreen on my face whenever I go outside. The tinted moisturizers are often too thick and make me break out. Female here.
IANF, but have somewhat sunburn prone light olive skin. I wear a moisturizer with sunscreen. So does my husband, who is VERY fair.
Female and I use products with sunscreen. Or straight sunscreen if I’m not wearing makeup that day. I live in Southern California as well, so it’s sunny most of the time. And though you didn’t ask, many times I’ll wear a hat for additional protection from the sun.
Thanks for the replies so far. I’m hoping some of the male dopers will answer too, though 
a) every day, without fail
b) female
I avoid this by not going outside.
Seriously, though, I only put sunscreen on my tattoo (and that obsessively, even though it’s usually covered by clothing) unless I’m going to be outside for long periods of time–then it goes on all over. Unfortunately, I tend to forget my ears, but fortunately even though I glow in the dark I don’t seem to burn that easily. Which is why I tend not to wear sunscreen.
Oh, and in case you couldn’t tell from the name, I’m female as well.
Female, and I use a moisturizer with an SPF of at least 15.
Years ago I didn’t, and I started to get not freckles, but light brown splotches on the high part of my cheekbones. Didn’t want any more of that.
I’m not that fair, but I’m starting to notice these same splotches on my cheekbones as well. I have started wearing SPF 35 moisturizer under my foundation every day whether I will be in the sun or not. It’s just part of my rountine now.
Male and no, I have greasy enough skin that anything on makes me feel really uncomfortable. Since I live in Australia I just have to accept that it’s a given that I’ll have a skin cancer or two at some point in my life and deal with it then.
That being said, I only burn about once a year which is pretty good for this climate and my so-pale-it’s-blinding complexion.
Male, quite pale and I burn quite easily.
I use sun screen only during sunny summer days during my vacation. When I am in sunnier countries I use it all the time.
Male and pale. I don’t use sunscreen unless I’m expecting to be unprotected for several hours.
The exposed parts of my body are generally tanned because I spend a small amount of time in the sun, often.
Very pale, I wear a moisturiser with sunscreen every day.
Female.
I have fair skin, and… no, I don’t.
I want to, but everything makes me so oily. My foundation has SPF 15 in it, and I bought it specifically for that purpose, planning to wear it every day, but I still usually don’t put it on. I’m very bad. I even purposely bought the best-smelling sunscreen in the entire universe but I never put it on! Tomorrow, I swear!
Oddly, though, I don’t burn. I remain as always glow-in-the-dark white with freckles. Perhaps I don’t spend enough time outside to burn.
Ooops, sorry, forgot to mention I’m female.
Female, and if I’m going outside, I put on sunscreen. If I’m going to be driving in a car with the window open, I put on sunscreen.
I used this great stuff that’s SPF 50, non-greasy, and comes in a stick so I can toss it into my purse easily and reapply it throughout the day. I may be a little paranoid, but I BURN.