I hate the term slut, generally, for so many reasons. First, there's the implications that someone having a lot of sex is bad. The second is that it's a gender-loaded term.
I'm also a bit... out of the loop. To me, sex is by it's nature, intimate. My wife can and does have casual sex and I'm fine with that both as it pertains to our relationship and as I see casual sex as a "just dandy" thing.
But I can't do it. So for me, having lots of sex would IMPLY intimacy. I know this isn't the case for everyone and I see no reason it should be but it's not something I relate to all that much.