I think there are many types of virginity. yeah, we always associate it with sex, but there is always something that someone will not cave in on. Drinking Alcohol, Sky Diving, Riding a Rollercoaster (which arguably could all be the same as sex). There are lots of wonderful experiences that people can have reservations or fears about and might only do that with someone they really trust.
Just look at porn stars, having sex is 2nd nature to them, almost like watching Saturday cartoons or going to church on Sunday, but some of them won't kiss unless they mean it, and some won't do other things unless they mean it and trust you, like cooking breakfast or staying around for the 2nd day. :D