The new study conducted by psychologists suggests that ovulation may improve women's ability to discern men's sexual orientation.
The small study was conducted on 40 heterosexual undergraduate women. Each were shown a variety of pictures of similar looking men. Some were gay while others were straight. The researchers found that when the women were closer to ovulating, they were better at telling them apart. However, the same wasn't true when they were shown photos of gay and straight women. The study also mentions that women who read a romantic story before looking at photos had better gaydar than those who didn't.
So basically, this study suggests that having eggs all ready to be fertilized could somehow make women better at finding someone who might like to fertilize them. While the findings are still highly debatable, it is still a fascinating theory.