you are viewing a single comment's thread.

view the rest of the comments →

[–]greybeard 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Biochemical research points to a natural four-year sexual cycle for the human female.

The article they cite doesn't have any sources and doesn't provide the biochemical data. This should be corrected unless they can produce the original source of that claimj