Name Of Several Married Couples' Movie in the 90s Whose Marriage Fails Because of Their Views on Sex?

I saw an American movie (probably released in the 90s) and the movie begins with a guy giving an interview or as if he were talking to a therapist that his marriage failed because of sex; and between his words, scenes cut back and forth to him having sex with his wife and talking about his marriage. His hair was dark brown or black and his wife's was dark brown. I remember during the back and forth scenes between his talk with the therapist and while they're having sex, his wife says"yeah, give me that". There's a blonde woman who's also sharing a similar experience about her failed marriage. Does anyone know the name of this movie? Thanks very much.