Something girls make up, to excuse their lack of self-control. A load of bull.
(And, yes, I'm a girl. I know what a period is, and it's nothing to irritate guys with. Jesus.)
Girl: God, I love you!
Guy: Love you, too, babe.
Girl: UGH, you're so insensitive!
Girl: Sorry, it's stupid PMS.
Guy: Give me a break.