Mm. OK, with that connotation of "disallowing", I would agree. It's not the connotation I would expect to ordinarily come to mind in conversation, and in particular your statements about "B wishes A would not sleep with others" emphasized a different understanding of "disallowing" in my mind.
Have you (implicitly or explicitly) promised each other to not have sex with anyone else for the time being (even though the promise is renegotiable)? For example, would it be OK with you if your husband went to (say) a conference abroad and had a one-night stand with someone there without telling you until afterwards? That'd sound as a stronger condition than "B wishes A would not sleep with others" -- I wish my grandma didn't smoke, but given that she's never promised me not to smoke...
Another month has passed and here is a new rationality quotes thread. The usual rules are: