Would you tell your friend that your S.O. has sexy/nude/whatever pictures of yourself to use? Isn't that just way to much information.

If they had pictures or video (Nude or otherwise) and they planned on getting some type of revenge with the those pictures through online means. And YES that does happen. Then I surely would tell them and warn them about it. But If it's in just a funny ha ha I'm only joking sort of way. Then it wouldn't be that big of a deal to me. But you have every right to not listen to something like THAT if you didn't want to. And she should have respected your wishes but some don't care about respect now a days unfortunately