I know some people have firm opinions on one side or the other of this argument. Personally I think that it completely depends on the nature of the relation of the couple. There are couples that do everything together. There are other couples that see things completely differently. There are spouses who want to know and spouses who don't want to know. While I would have an opinion for every particular couple I know I do not think there is a one size fits all solution. I also think that you should not force your opinion on such a sensitive issue or judge the people thinking differently from you.
