I am one of those pale pommy pricks, so I learned the hard way when i was young. I burn, i blister and i hurt. I dont like pain, so I will go to great odds to avoid sunburn. Even still, those few times i get sunburn have surfaced (I too am 31) and I was diagnosed with a fairly harmless skin cancer on my face about 6 months ago. Its enough to make me more cautious, even though I feel I am already careful. Obviously I am not carefull enough.