I dont think it's a "woman thang" like the men describe. I think it's a "man thing"...they get all freaked out when the woman are having the "girl stuff" happen every month, and so they blame every mood swing on the monthly girl stuff no matter whether or not we're experiencing the girl stuff at that moment.

I get really ticked off if my dad makes a comment about PMS if I'm in a bad mood...it's insulting.