AndHold. To put it simply, the religious alt-right believes that sex should only happen within a marriage. And that contraception availability for unmarried people, sex education, and abortion actively encourage sex outside of marriage. They believe it to the point that its mere availability will turn adults into ravening sex maniacs. And that it will make young boys and girls unable to say no. They further believe that if you should be so unfortunate/depraved as to have sex outside of marriage, then you deserve God's punishment; pregnancy and/or an STI. Naturally the 'sin' of pregnancy can be expiated by marriage or giving the child up for adoption. But single mothers should be vilified and denied basic benefits. The fathers? Not so much. Boys will be boys after all and she should have kept her legs closed.
This is the beliefs of the church I was raised in. It's the belief of most of our so-called Christian alt-right friends. Even those who slept together before marriage. Because of course, they got married so that makes it all OK.