That was because they were not aroused, were scared, and often sex was everything from only out of obligation to barely consensual to completely nonconsensual and by force because of that, and because historically, first sex for women was not with someone they were in love with or attracted to, we can also know that for some women who had bleeding at first intercourse through history.
As a result of all those forms of ideas and social precedents, bleeding ended up being often regarded as something that better well happen, and because sometimes “proof” must be shown that a lady ended up being, in reality, a virgin as she said she had been.
Take a look at this passage from Deuteronomy 22 within the Old Testament, getting concept of this fat of virginity ever sold, also just exactly what the results for a lady might be if she hadn’t bled with sex:
Then shall the father of the damsel, and her mother, take and bring forth the tokens of the damsel’s virginity unto the elders of the city in the gate if any man take a wife, and go in unto her, and hate her, and give occasions of speech against her, and bring up an evil name upon her, and say, I took this woman, and when I came to her, I found her not a maid. Read more