hm, let's see...definitely at bars and parties. and in barcelona! anywhere in spain, really, but barcelona takes the cake. literally as soon as my friends and i stepped out of the bus, these (old!) guys came up to us and offered us their arm. and they'll just loiter everywhere and shout things at you, anything they know in English, including "One, two, three!" :P
like someone else said before though, it's really more about who's hitting on me - which is unfortunate that i'm so vain because even the good-looking ones can be pervy too, hahaha. but i definitely get really freaked out at any men who are way older than me, icky-looking, or obviously have yellow fever (i'm asian, in case you can't tell from my name) - you know, those idiots who say things like, "konichiwa, chinese princess"