not often! although sometimes I'll remember the person not purely because they were attractive, but because we kind of had a moment. Like if we look at each other and if we both know that we should say hi but neither person is confident enough. Aw I love those moments! Despite the regret of not talking afterwards.
Once - ever. Not even kidding. I was significantly younger, and saw the boy of my dreams. Other than that, I don't care for - nor do I get close enough - to people to notice their looks. If I do happen to notice someone like that, it's because they have traits that I specifically find attractive. :P I have such odd taste that it would be a rarity, perhaps even a miracle.
Never. Not anymore. Looks, now days, have become such an easy way for a lot of people to half ass their personality. I feel that a lot of selfish bitches, hoes, players, and jerks often get away with their ugliness because they're physically appealing. So it doesn't matter how attractive they are to me because at the end of the day, that pretty face or hot body can be worthless if they don't have the personality, heart, and soul to match up.