Also, I have been surprised to find how much in the traditional, wealthy suburbs, women are still nervous about introducing their husbands (whom they don’t apparently trust to much) to single female friends.
Lots of female-only (particularly by day) and couples only (evenings and weekends) socializing that is very structured.
The husband having lost his social circle relies on his wife’s, which can include single girlfriends. And yes, I’ve seen the wary eye-balling, and learned to stay away from any double entendres on the occasion, because you’ll pay when you get home.