Comment by bluGill

If that is your motivation you just blanket send those advertisements all month. Because you want women to think of you when they have need. Some women are stocking up before they have need, and so the coupon when they are having their period is when they won't be buying supplies. Even those who are buying as they have need, if they are out they are buying from the closest store at whatever price, while those who are not in an emergency know where the low prices are (wal-mart or such)