Again that's not the way I heard it. It was some elaboration of the transubstantiation thing, that if you bled you somehow lost Christ by bleeding. It held the same if you had recently had oral surgery, for instance.
We briefly attended the local ROCOR church and the priest had come from Etna and he handed out one of their booklets, which explained it like this.
There was something about men too.
It's ridiculous because if you take it far enough, well, never mind. Just suffice to say there was some belief that one could lose the Body and Blood of Christ in a body fluid. Etna is bizarre, if you ask me. But it was not just about women, as I was told this stuff.
People like this give the Church the reputation of being in the "dark ages." The Orthodox Church I know welcomes science -- because science reveals ever more God's glory.