Can A Teen Girl Have Sex And Still Be A Virgin?

Of course not - a virgin is someone who hasn't had sexual intercourse!

What Counts As Sex?
This all depends on the person, really. Some people class any sexual act (including touching or being touched down below, or oral sex) as "having sex", whereas other people reserve the term for actual penetration of the vagina or anus.

Can You Get Your Virginity Back Once You've Had Sex?
The short answer is "no". However, you can have surgery that restores the hymen (a membrane that's broken when you first have sex) so that it seems as if you're a virgin again.

However, this all seems a bit silly to me - many girls don't even have a hymen when they have sex for the first time, as it's often already been torn during sport or by using tampons.