For me it's neither. I don't generally get jealous (it does happen but not that often) because I consider jealous to be pointless. I remember being 12 and realizing that, which is why it tends to amuse me that so many adults NEVER realize it. Nobody has everything no matter what we think and there is a downside to everything. So I just don't get the point of jealousy.
I also don't assume a girl is sleezy or slutty just because she is pretty. I usually don't even think a girl is that way even when she says or does things that will usually make other people think that about her. Because really, who am I to judge? It sorta disturbs me the way we females tear each other down. Plus I have been called a bitch, slut, whore, etc. more times than I care to count and I don't consider myself to be any of those things. Usually the people who have said that were other females who didn't know me all that well. I can't say for sure what motivated them. Jealousy? Hatred? I have no idea. But I know what it feels like so I try not to do that to other girls. From time to time if a girl does something particularly shocking then I might react surprised or even horrified, but I try not to formulate an opinion about her based on my initial reaction to what she said or did.
And why is it that if a guy is sexually "free" we (society in general) don't think twice about it, or even look at him positively. Yet a girl acts the same way and we label her a whore. It disturbs me.