Can guys tell whether a girl is a virgin or not?

Any guy who asks that of a girl, is just a classless slime ball and should be avoided at all costs. It really isn't something someone with any civility asks.
If the girl chooses to bring up the subject, that is her prerogative, otherwise it is none of a guy's business.

What is bad about NOT being a virgin????????????

I don't why some guys ask this. I know the whole "oh yeah I was just checking to make sure you're clean" but some STDs can be conceived just from sharing needles, razors and toothpicks. It's probably just to stroke their own egos.

Being called innocent is just a comment most of the time. I was called innocent when I was in high school because I don't tend to drink (I have low tolerance).

A lot of guys can pick up on inexperience but not necessarily virginity, though. Hesitation before touching, awkward kissing and a lot of nervousness generally indicate that.

I should also add that bleeding during initial penetration doesn't occur for all virgin girls either. Oh and not all bleeding is from hymenal tissue, it can be from vaginal tissue as well.

A majority of guys do this? It hardly seems possible that you could have come to that conclusion from personal experience, considering the population of the planet. I find your assumption to be offensive due to it's sexist nature.

I also feel that your question is poorly worded. I can tell if they scream when penetrated and then there's blood on the bed. Or maybe they just like screaming and they are having their menstrual purge. Or maybe they are just faking being virgins.

I have to wonder how old these guys are, because it doesn't sound like the fast track to getting laid. But I often boggle that any of the guys under 25 that I meet can actually get laid. Most of them are about as smooth as sand paper and smell like the hind end of pachyderm.

Why does it matter?

The hymen is not supposed to tear during sex. That's a myth. If it does, then there is not enough lubrication. Either the person is not aroused enough for the vagina to produce enough lubrication, or there is some other reason, maybe a medical one.

If they're really tight, then you're a bad lay lol. That's why it seems like they loosen the more you have sex with them. You're getting better at pleasing them/they're getting better at knowing what they like.

The vast majority of boys have never seen a hymen in their lives and would not even know where it is situated in the vagina. So in answer to your question, No boys would not know if you are a virgin or not!

Not even if they have sex with you would they be able to tell whether you were or were not a virgin. All you have to do is make is as if you have never seen a penis before and do not know what to do with it and make a bit of noise when they do get it in and they will be convinced you are a "virgin"

For a an ordinary idiot there is no way to tell just by looks that if a girl is virgin or not, However some playboy type dudes (who came across with many sluts) can read body language of sluts pretty well and usually their guess is right (again these guesses are based upon body language of a girl)

You, Ms. OP, sound like a very suspicious person. And, your suspicions can sabotage a healthy sexual attitude. Stop worrying about your hymen, and start working on your brain. The brain is definitely a sexual organ.

To answer the question, I don't think you can tell for sure if a girl is a virgin. "Innocent" might be an indication towards not having much experience in that area, but not necessarily a virgin. If a girl is extremely introverted and shy, I would assume she hasn't been around much. However, I believe if a girl is very aggressive and open you can tell she has been around a lot by the way she acts.