She’s lit. Look at all the things my vagina can do! When your vagina is happy and healthy and it’s getting well-fucked on a regular basis, it is very productive. In fact, your life and work output is directly related to your vaginal satisfaction.
No, they’re not supposed to suck. It’s an accepted idea in our culture that women are “cursed” with their “time of the month.” Menstruation is viewed as an untimely, unsightly experience that women need to endure—like some kind of extension of the biblical punishment for the sin of having been born a woman.