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Angelina but after the wedding, no one but the two of you will be interested
Both could be interested if explained the advantage.
Angelina sex life is something very special and intimate
That's exactly the reason, and they should wait at least until night.
Laura But in this particular case his mother requires it, that means she doesn't trust him
No, it's because her parents are irresponsible. She will have to present that certificate right before marriage as a proof she didn't sleep with him yet. Otherwise it would be the shame for both families and other negative consequences.
Joh Another way is she doesn't trust her or she will be sure nothing can happen like rape.
Not rape, but seduction.