How important is for a girl to keep her virginity?

I am Christian, so I understand that it can't be a union of bodies without another of spirits (which by its own nature will be forever) But I ask this also because I fell in love of a girl who seems to be something like a bookworm, tough she is pretty as a thuringian jewish fairy... so I don't know. I also am interested at girl's being... specially at British ones.