One possible answer is here.
Sex is the one of the most powerful urges and is for continuance of the species.
However, their wives also have the problem because of the husbands' inability to get and keep an erection, and we have found these wives are not afraid to recommend their husbands get treatment. C.R.T. Branford, OR My husband has had erection problems since our second year of marriage and he tried every conventional method available except surgery to no avail. I was convinced to bring my husband in for a talk and to my surprise he did the program. All I can say is it has renewed our sex life. It has also strengthened our marriage.