These kinds of stories are quite concerning. Well, they're not that common thankfully. Prevention is key. At parties, the hosts can make it clear that any form of inappropriate behavior won't be tolerated. And for the wives themselves, they should trust their instincts. If a situation seems off, they should remove themselves from it immediately.
Such stories are unfortunately not unheard of, but they are not common in all social settings. To prevent such incidents, parties should have proper security and a code of conduct. Also, women can be vigilant, stay in groups, and not accept drinks from strangers.
Stories of a wife being groped at a party are distressing. While it's hard to say how common they are exactly, no amount of occurrence is acceptable. For prevention, education about respect and boundaries is crucial. People should be taught from a young age to respect others' personal space. At parties, there could be designated safe areas for women, and staff or friends should be on the lookout for any signs of inappropriate behavior.