Varts does not have anything to do with virginity. If you have a vagina, you can vart.
It is caused by air going up into your vagina and being squeezed out again. As you know, your vagina is a closed 'pipe'. Nothing except sperm can go any further up into you. Everything that you put into your vagina stays there unless it comes out the way it went in. Your vagina is also collapsed onto itself like a fireman's hose when you are not aroused. Trapped air escaping will thus make the vart sound when it squeeze out through the unaroused vaginal opening, just like a normal fart.
There are a number of ways you can fart:
* A specific movement you make allows air to be sucked into your vagina by the movements, like gymnastics, dancing, marshal arts, squatting, cheering. When you make another type of movement it gets squeezed out again and VAAART!
* When you masturbate or get sexually aroused, the top of your vagina will 'balloon' and suck in air. When your vagina returns to the normal state, it will vart out this air. You can also push air in with a sex toy and it will vart out again.
* During oral sex your partner blows into your vagina. This is dangerous as air under pressure can go into your cervix, uterus, fallopian tubes and into your body cavity. This should not be done.
Of course this often happens during sex in certain positions where the man will 'pump' air into your vagina with his penis as part of normal intercourse and it will vart out again when the pressure gets high enough to force the air out between your vaginal walls and his penis (the same can happen with a sex toy). You are however a virgin by your own admission so this should not be a problem for you.
Of course varting in other peoples company can be embarrassing but it happens to every woman at some stage.