Coz they've got beards and blokes mistake them for blokes. Online they can show them the beard between their legs.
Ignore my advice at your own peril... https://www.summitmedicalgroup.com/library/adult_health/oph_scotoma/
Thankfully mine is temporary and definitely a precursor to a migraine. ****ing weird though sensation though, sometimes I quite enjoy the visuals. But overall it's not a pleasant experience.
I've got a couple of mates who are GP's so I've spoken with them about it. tbh the medical profession are a bit in the dark about the causes. Thankfully I don't get them too often. And can go months without an episode, but just had cluster of them this week and wondered if anybody else on here gets them ?