I see several social problems in the use of Viagra indiscriminately. It may lead to more sexual promiscuity and infidelity. Recently and old man in New York who used Viagra, left his wife and then went for a much younger lady. His wife sued the company. Many women are also complaining that they are being subject to Viagra attacks by their husbands' and boyfriends even if they are not in a mood.
Sex is an expression and extension of love.
In the absence of love, sex becomes a boring routine. Forced sex even in marriage is rape. Instead of trying to achieve potency, men should try to achieve love and respect for and from their wives. Thus Islamic sexuality is based on nature and not attempting to achieve a quick result. The human body is a wonderful creation of God, but not a sex machine.