Our expert says:
If the other girl is under age, what he is doing is the crime of statutory rape ( the law assumes than an under-age person cannot give legal consent ). THis sounds like a really nasty young girl, cheeky and cruel. If the kid is threatening her, and your friend can get some evidence of this ( witnesses or written threats ) she can lay charges ( making such threats is also criminal ) and can get a court order / interdict, forbidding the child from doing this or from approaching her or her home.
As said, maybe speak to the husband, saying that other people are talking about this ( this horrible little girls sounds proud of it, and is probably talking more widely ) and that his wife is likely to hear of this --- and that if the girl is under the legal age, he could go to jail for having sex with her. Otherwise, it is up to you to decide whether to tell the wife --- she is likely to discover this anyway, and if the ugly little girl is promiscuous, she could infect the husband who could infect the wife, and it is her right to know about that risk
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