Huh? Are you already sleeping with your friend’s wife and trying to decide if you should let him know or because of your friend sharing pics and details you want to fuck his wife? If you are already sleeping with her than his sharing pics and details may be his way of trying to find out if his wife is cheating. If you arent sleeping with her this may be his way of testing the waters to see if you are willing to sleep with her. Either way talk to your friend. Im sure you can enjoy a relationship with the wife if that is your desire. It sounds like your friend is wanting you to fuck her at least in your mind by sharing her with you even on the level he his doing so with pics and verbal descriptions. My biggest question is whether she is aware of her husband sharing with you and of her desire to have other partners.