A lot of wives lose interest in sex, especially after the children come, so they don't have sex with their husbands anymore but then they don't want their husbands to have sex with anyone else either.
Women's logic, eh?
People could use this for justification to have sex with WGs and in return people could ask their wives. partners, gf to have fun or sleep with whoever he want to, ask her to join swinger or sex party, ....
If there is an official vote I will vote for this .... Hopefully this practice will be more acceptable in the modern society in the future.