Couple staying together and yet he has declared to the wife that he is going to look elsewhere and she doesn’t?

Maybe she's a little ticked that her husband discusses her ual habits with friends. That's personal business between them and the walls, not you and us and the entire Yahoo community. I know you're trying to be helpful, but it's their marriage, not yours. Now, if this situation truly involved you, say it was your marriage, then I'd say it sounds like the man isn't doing it for her anymore. If counseling didn't work, medical testing was done and the need for an anti-depressant was ruled out, then this marriage has shifted into "buddy" mode and it may be time to consider a separation to see if it's worth holding onto.