The study involved 33 men who smelled feminine perfume and looked at pictures of women's faces while hooked up to a special hormone.
Researchers have mapped the route of darcin from the urine to the brain and suggest why some mice respond by showing signs of attraction and others do not.
This is the first of two parts of a major study evaluating the potential health effects of BPA. The final conclusions won't be available until 2019.
Some experts think the procedure could be a human rights violation.
"You can choose to go organic, you can become a vegan, but according to this particular study, you couldn't choose to be free of BPA in your diet."
"It's women's excuse for when they need a break," Robyn Stein DeLuca said.
And really, who can blame them?
A newly identified antibody increases bone mass and decreases body fat in mice, though human studies are some way off.
A study found that women who take high-estrogen contraception have a higher rate of developing breast cancer.