I ran across an article on Scientific American called, "The Scent of Your Thoughts". It is about a college student who made a comment around researchers that women's menstrual cycles sync up the same way mice sync their ovary cycles. The researchers gave her a scorned look. Of course this was in the 1960's, and I can almost be sure that all of the researchers were men.
Now that it is years later, technology has greatly advanced, but I still believe the college student was correct. I believe this partly due to science and partly due to personal experience.
The science side- evidence has suggested that humans unknowingly release chemicals to other humans that release messages. These "chemical messages" are commonly seen to carry over to family members or close friends. So, who is to say that the chemical messages cannot relate to ovulation cycles or menstrual cycles? There is no study saying that they do or do not relate.
The personal side- in high school, I was the only one in my main group, of about four friends, that was on birth control. After about three months of me being on it, my friends and I all had our menstrual cycles within a week of each other. Since my periods were controlled, I was like the base to which my friends' cycles were able to link up to. How were they able to do that? Our bodies had to be communicating somehow other than talking.
With personal experience and science news, I honestly believe that females have the ability to sync on ovulation and menstrual cycles due to the release of chemicals in their bodies that communicate to other females. Furthermore, scientists are now trying to decode compounds released by humans to see what role they are playing or what message they are sending. I am sure most females will agree with these findings, males... maybe not.
Here is the link to the post in Scientific American:
"The Scent of Your Thoughts" Post