He does need to see the doctor about the issue and trust me its not easy. I am a 29 year old married male, I've been with my wife total of 9 years and married for 2, recently I had the fairly the same problem, lack of sexual desire and sometimes it caused me not to get an erection. My wife would get upset because she thought she wasn't attractive anymore and that i was cheating on her which was not the case! this made me mad as well thus not resulting in intamacy, at first we talked obout it and i told her i would go see a doctor but i didn't for a while. Finally i decided i would rather save our relantionship and put up with a little embarransing doctor conversation. The doctor told me that there is A LOT of men young or old that suffer with some form of ED whether is physical or in most cases mentally. I couldnt belive i was one of them, I am 29, 5'8" 170lbs atheletic a guy that works out every day and in perfect health from what the doctor told me. The doc prescribed me levitra which makes all the difference!