The drug works in the brain to modulate serotonin, which is a negative transmitter for sexual function. "Because of that, it seems to increase libido," he told ABCNews.com.
"If we are medicalizing hypoactive sexual disorders, than why treat it?" asked Guay. "A lot of things are a natural part of life -- like cataracts -- but we treat them."
He admits the drug may do little to help women become orgasmic, who, like men, can be affected by obesity and drugs like beta blockers that decrease the flow of blood to the genitals.
"It shouldn't be given like candy to every women coming in with bad feelings about herself," Guay told ABCNews.com.
"It's absolutely not a cure-all, and no one in the company or the advisory board things it's a cure-all for everything, but it can help."