Would you rather want to wait till marriage to intimately know your partner or will you rather know everything there is before marriage?
Fact: sex has become a thing that is no more respected but expression to show exciting feelings amongst partners, sexual intercourse has become so common almost like a social activity and as a result of urges satisfactory and monetization, the dignity of sexual intercourse goes lost as generations to generation gets exposed to it.
So forth nowadays sex is no more an intercourse observed amongst partners in intimate relationship or marriage but has become a lifestyle for most people.
Back in the days when marrying virgins was a common was when sex before marriage has something to write about but today's, we even find underage involved with sex so, it almost give hopelessness to anyone dreaming to marry a virgin and on that note. It becomes almost impossible to get married before sex when your future partner is somewhere out there already an expert. So nothing to reserve or kept special in the "marriage before sex"