What's the best way to approach your spouse to do her part in the house?

This is a real case of a spouse who wants her husband not only to be the sole provider, but also to come home after work and do the chores in the house. She complains of aches that don’t allow her to do the chores herself. However, when it comes to going out and having fun she has no complains, no aches. Although she takes care of her two young kids, I would imagine she should do more than that. She is a kinda lay back kind of gal that even drags her feet as she walks. Both of them are good friends of mine and I just don’t have any suggestions for my friend on how to approach his spouse. He’s growing tired of this situation. Counseling hasn’t helped. What would you recommend is the best way to change that kind of attitude?