Can you really tell if someone is or isn't a virgin?

in 7th grade, these guys were talkin and were like they can tell if a girl is a virgin or not. I think this is ridiculous. How can you tell without asking them? Not possible...right?

The only way to tell is with an internal examination performed by a doctor.

When you've had sex for the first time, it's normal to bleed, but since everybody is different (I didn't bleed), you can't use that as evidence.

It's possible if you've had sex a lot that you are not as tight as a virgin would be - but even that is just heresy.

exactly what I thought
thanx=D

yeah only a doctor can tell , it if the hymen is broken I suppose there may be a chance of knowing if while having sex the girl is loosedown there