My question is whether boys are also called as virgin. If so then whom are called virgin. Boys who undergo sexual intersection with the boys are also called as virgins.
Virgin does apply to both sexes. In general it is accepted to mean that a person hasn't had penetrative intercourse. I would say most people today do not consider mutual masturbation and oral sex to take someone's virginity. Once there is penetration - in either a boy or girl - virginity is lost. This varies, of course, based on regional and religious believes.