A must read for any man who has a girlfriend or wife who is not as interested in sex as she used to be. This long but super interesting article talks about female arousal and the trials of using two combination drugs.
"Both drugs have a peppermint-flavored testosterone coating that melts in the mouth. When the exterior is gone, the woman swallows a delayed-release inner tablet. In Lybrido, this inner pill is a close cousin of Viagra. The idea is that the Viagra-like molecule, by making extra blood flow to the genitals and adding to swelling and sensation, will work in conjunction with the testosterone. Together they will stir the mind to be more aware of erotic impulses; together they will help spark dopamine networks. Lybridos uses a compound called buspirone instead of the Viagra-like substance. Buspirone was originally used as an anti-anxiety medication, and if taken every day it can elevate serotonin in the brain. But as long as it’s taken no more than every other day, it has a unique short-term effect: for a few hours, serotonin is suppressed."
More details : The Female Viagra?