That’s a bit of a 矛盾 (contradiction). 
It’s already been pointed out, but this is a hollow insurance policy because there’s no way to verify it. As explained elsewhere, the hymen is no guarantee of anything, and bleeding can result from non-virginal sex. Also, there are ways to get STD’s without standard sex, and even without sexual contact at all. 
Abstinence is a risk mitigator, but it’s no guarantee.
And then there’s this curious little game theory paradox:
(I’m not saying it’s true, just that it makes an interesting thought experiment, and who knows? It may be true.)
Hence the old religious law: paternity is a matter of opinion, maternity a matter of fact, so you’re not born Jewish unless your mother is Jewish. That’s not 100% foolproof either – babies can be switched at birth and so on – but it’s closer to a guarantee than a sworn affidavit of virginity.
Indeed. The whole show me my daughter-in-law’s marital bedsheets thing used to be a thing in East Asia as well. When did it go out of fashion? Early to mid 20th century? 
Maybe @hansioux knows.
I tend to agree, but it’s a fairly recent development! I mean it’s hard to imagine a culturally Catholic country producing a film like this before, say, the 1990’s, or else it would probably cause a stir. Correct me if I’m missing something there.
Riiiight… and that brings me to my next recommendation. @ChaZui should try watching this with the boyfriend, if he can’t make it to the end of Borat. (Spoiler for Borat: it turns out the love of his life, Pamela Anderson, is somehow not actually a virgin.)
And then there’s the famous case of the “Virgin Queen” Elizabeth I. This film doesn’t cover up her affairs but does give the “virgin” concept an interesting spin at the end. 
It also happens to be a good film, like the others I’ve mentioned (except maybe Borat). 
