Because of social norms to not talk about menstruation, I tend to cut-tag such entries. But b/c I agree with you and also b/c of varying definitions of sex/gender I do not lock the posts to women only.

It's kinda like my policy on talking about my skin condition: B/c most people don't want to read about pain and pus, I cut-tag them, but b/c I want to increase awareness of the condition I do not lock them.