RavenSky
The Doctor's Wife
I think there is a huge difference between a man who actually leaves a relationship because he is dissatisfied with it, and one who uses threats of leaving in order to manipulate the woman. (And yes, my point applies to any couple regardless the genders involved on either side).
So it's unacceptable to express dissatisfaction with the relationship, if the dissatisfaction on said relationship is the sex?
Did I say that? No.
I said: "one who uses threats of leaving in order to manipulate" There is also a HUGE difference between someone in a relationship genuinely trying to work on the relationship vs someone who uses threats of leaving in order to manipulate the other person.