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This should really go without saying. Your woman needs to know that you are protecting her and feel the safety of you making sure she is okay. Even if it's just a text, and maybe a picture to tease you husband, if he likes that sort of thing!Yes, it "matters" ... if for no other reason than to let the spouse KNOW where she is for safety sakes. If the understood agreement is that she let her spouse know when she's meeting with her lovers, its a breach of the agreement when she doesn't do it.
Regardless whether the spouse participates, is present, or not ... he needs to know she's safe and who to contact when she doesn't return as scheduled.