Every woman has an Aunt Flo. Young girls may not have met her yet. Old women may have long said "Farewell" to the good relative. For most women, she makes a monthly visit. Dedicated, if you ask me.
Or to some, Aunt Flo takes an extended vacation, shows up after a couple of years and says, "Holy Macaroni! You have a stinkin' toddler!" And subsequently makes it the worst visit you have had with her in your whole life. At first, you are excited to see her again. But then you realize she isn't happy. She can't believe that you fooled her into that long absence, and is so upset that she brings her fury down heavily, unrelentingly, and painfully.
When she finally leaves again, you are wiping your brow in genuine relief. Then you beg your husband to please, please, help trick her into another extended vacation. Because life without Aunt Flo is a comfortable life, indeed. So you and your husband start formulating plans to keep the bad Aunt away for a while. You don't know if the plans will work, but you will keep trying until they do.