relationship destroying behavior.
Thanks DJS for your well articulated response. "Withholding sex" does not occur in a vacuum - although you could be forgiven for thinking that's the case when some men react to not "getting any" lately.
Context counts for everything. I do not wish to frame this as "male-bad female-good" problem but unless the "meaning" of sexual relations is understood by both sides, sex becomes one more punishing variable within an already-strained relationship of so many other negative variables.
But the phrase "Using sex as a weapon" is a staunchly male way of framing the problem. Only a male could come up with an explanation that speaks the language of aggression and warfare. It is ironic that when applied to women - long oppressed by male dominated societies - "weapon" is defined as a passive withholding. Power differentials are still very often in favor of males - but should a woman assert herself, watch out: Men will start using all manner of aggressive language to frame the problem.
Yes, it is not a good relationship strategy to "withhold" sex. But neither is it a good relationship strategy to make significant announcements about a change in fundamental beliefs and not at some level reach out to one's confused and/or hurt spouse and build a safe environment so that both can work towards a respectful understanding.
Remove the issue of religious differences, and this could be just another instance of a couple unable and/or unwilling to understand and "be there" for one another. And let's not forget the "bullying" non-JW wives can suffer when their husband starts developing an interest in the JW message and he insensitively can't keep his mouth shut about his faith and what he expects his wife to do. Even in this instance, I would want to look beyond the religion and see the wider context within which both parties function.