Can a doctor tell if your a virgin?

They can't if you're a guy, and not conclusively if you're a girl, the preasance of a hymen (or lack there of) is not nessecarily reliable, because the hymen can be broken while playing sports, or masturbating, and (obviously) during intercourse. So if you have a largely intact hymen, the doctor will assume (not that they care) that you are a virgin. And if not, they won't be able to draw a conclusion (nor will they want to) about wether or not you are a virgin, they won't tell your parents anyhow, so it really doesn't matter.