They did a very scientific study to determine if there really was something to PMS causing impaired thought processes. they discovered that it in fact can impair one's ability for rational thought.
they took the study further to determine how often this problem would present itself.
They found out that due to hormonal fluctuations, women experience this impaired thought process once a month, an average of 2 days per month. They further discovered that men experience this same phenomenon approximately 10 x's a day

It was either 10x's a day, or every 10 min (not sure which) so I decided to err on the side of caution.

Besides, ...everyone knows testosterone causes brain damage.
