Vasodilators, such as Viagra, Cialis, and Levitra, enhance blood flow to the penis.
It also helps to understand that it's normal for erections to come and go during lovemaking -- "It can happen two to five times in a 45-minute sexual session," Mc Carthy says.
Serious illnesses, such as cancer and depression, can certainly dampen any thoughts of sex.
The paradox of modern relationships is that greater intimacy may not make for better sex.
It is not only women who respond - with sexiness or inhibited sexuality - to how happy they are in their relationship.
Problems with sex can - but do not always - signal other problems in the relationship that need to be addressed.
Loss of libido also makes men more unhappy about the rest of their lives than it does women.
Only 23% of men with loss of libido say they still feel very happy about life in general vs.