I’m not sure what you mean. In some contexts I think it makes sense to refer to women, in some it makes sense to refer to a specific issue, function or body part.
In which case as well as being misogynistic, they’ve had a pretty basic biology fail. If it’s truly important to refer to the body part, in relation to menstruation, then the vagina is hardly relevant. Surely they’d refer to the uterus, or ovaries, or Fallopian tubes, all of which are much more functional in terms of a woman’s menstrual cycle. My vagina doesn’t just randomly decide to bleed every month.