Consenting people can have sex that resembles to an extent what this horrible thing can be, and it's perfectly loving and kosher. If it's a married woman, if it's homosexuality, if you kidnapped the person, ok we're talking about other things, but a single man sees a single woman and makes this sin G-d forbid, the sex isn't the crime, it's how it's done.
It's for sure a violation of the 7th Noachide commandment outside of mudrat countries. In a craphole like Kazakhstan or the smaller craphole south of it with a similar name where to marry someone, you kidnap her (https://www.buzzfeed.com/susiearmitage/this-horrifying-viral-video-of-bride-kidnapping-has-spurred?utm_term=.bbXbwj65Q#.ywkMjwZy9). In this case, it's not a violation of the seventh, but clearly you stole that girl's freedom. Now is every time you have sex considered theft, and every second you keep her there if she always wants to go?
A Gentile man is permitted within Torah Law to marry off his daughter as a minor to any allowed partner who is fitting in his eyes, and it is thus fitting that a girl's father or the head of the household will be involved with marrying off all the daughters (even as adults) to fitting matches. Nevertheless, it is only fitting to marry off one's daughter, either a minor or an adult, with her knowledge and consent.
It is the custom of certain nations, families or clans that the father of the family, or another relative, decides for the woman to whom she should be married, and they then force her to marry that man, with the woman having no choice to protest against the marriage. This is contemptible and improper. Nevertheless, once this is done and the woman is referred to by all as this man's wife, she is considered fully married, and another man who cohabits with her is liable if she is at least twelve years old.
When it is clear the entire time that she cries and protests against the marriage, it is forbidden for her husband to force her to have relations, and as long as she does not willingly consent to have relations with him, she is not completely married. Nevertheless, if and when she is silent and accepts and does not protest her marriage, even though she did not agree to it at first, then this is sufficient for her to be considered by all as his wife, and to be fully married.