My husband has been unfaithful at least twice in the past with a one night stand and a 7 month affair that ended only after being caught. He began using Viagra during the long term affair. He stopped using it for a couple of years but recently began using it again ( I was aware this time). He travels a lot and I noticed he was taking it with him in his suitcase. I began counting them before he left and upon his arrival home noticing 1-2 would be gone. I confronted him and he states he takes them to masturbate and there is no one else. I m having more than a difficult time believing he would need to or deal with the headaches to masturbate. Any advice?