The urge to have sex is in our instincts and so are the skills. The way you reach the rapture at the climax of sex might change but the intensity of the pleasure itself should remain unchanged. When a man and woman who are married to each other and are virgins first engage in an intercourse with each others' consent in full consciousness, they lead each other into an overwhelming divine experience which cannot be any less than 'mukti'. That is the only way to get a taste of nirvana while you are alive, and because of its connection with the divine world the sex between virgins used to be celebrated in the ancient times. That celebration is now called marriage. So, if you care for such ultimate joy then you should probably remain a virgin and marry one too. That would be marriage in the real sense which is consistent with its original norms-marriage of two souls that carry each other to a transcendental realm. So, in the ancient times when somebody would say 'they are married' that would mean they lead each other to the divine joy and thus, both of them would be respected as couples because of their allusions to the divine experience.