I think Frazer & Gimbutas treat this matter, that the moon's celebrants were menstruating women, thought of as magical timekeepers. Hence the Indo-European witch, spinning at night, conjuring under a full moon: the sacred virginal moon-goddess Diana-Artemis, to see whom naked is to be transformed into a dead man, etc. There's also this, which though interesting is suspect. I don't know what special prerogative Queerists & Trans-scholars have in the realm of comparative myth.
Then again, in Balto-Slavic & Germanic myth the moon is an hombre, so maybe the Finnic peoples had a hand in it.
That goes to show you how Greek mythology was so influenced by the Near East. Although there are IE male sun gods.
I'll go through my books and post about what I can find soon.Speaking of equestrian-loving PIE, I wonder how far back variations on the white horse go? From what I'm reading he seems to pop up in the skies of many a culture. Zoroastrianism has the White Stallion in Sirius, which just so happens to be the brightest star in the skies, fairly significant I'd imagine. The Celts has/have Rhionann, Norse; Sleinir, Bhuddists, Khantaka, to name only a few.