I'm in the "it depends" range up there... and here's my take on things from my standpoint (and please, remember, it's just my personal opinion).
If you're playing around with a few people here and there because you're not in any real relationship, no biggie. Even if you're lonely and bar-hopping and meeting some new people, I'm not going to take issue if you're a friend of mine.
If you're just fucking to fuck or feel good about yourself and sleeping with a ton of people (say - I dunno, more than 2-3 a week/10 a month? Just trying to give a number for sake of a number here...), I'm going to pull out the slut card and smack you down with it.
If it's THAT extreme - then what kind of self-respect is there? Are you looking out for yourself? Really? Sure, playing around and sleeping with multiple people can be fun, but safety first, here. If it's that many, then how do you know you're not going to get abused, taken advantage of, raped, drugged, or who knows what else? If it's that many, you obviously don't know all of these people you're sleeping with. Trojan boasts a 7-12% failure rate if a condom is used improperly - and a 3-7% failure rate if used correctly, so even if you're using condoms, there's always a possibility there of failure (due to breakage, breakdown, etc.) and if it's that many, there's that much more chance of STD, STI, Pregnancy scares, etc.
What are you getting out of it? Do you just need to get off? Are you trying to make dudes like you? Trying to make you feel better about yourself? Feeling good because someone wants to fuck or says you're pretty? What's the draw?
I'm currently single, myself... I see someone from time to time and fool around, but we're not dating. I recently slept with someone else that I've known for ages and have plans on "hanging out" with someone else (and not coming home), but even just those three had me questioning myself as to what my motives with any of them were. I've had PLENTY of opportunity to get laid otherwise, I could have potentially slept with a dozen or more men in the past month, but I'd rather be safe about things... keep my numbers down, make sure it's someone that I really WANT to sleep with (for any number of reasons), and if I'm just wanting to get off, I can probably have a better orgasm with a vibrator anyway, if I REALLY wanted it - and then I wouldn't have to be self-conscious of my body, nervous because he was cute, etc.
Are you being tested at ANY point between these guys? Sometimes you don't even KNOW the condom failed - maybe there was a pinhole, maybe it broke upon entry and you didn't feel it and he didn't tell you... seriously, that's some dangerous shit right there. Just telling it to you straight up as I would one of my friends.
So really, elaborate for us - how many is it? What's the reason? How safe are you being? The pot can't exactly call the kettle black if it's shiny and chrome - you know?