My Wandering Vagina is so Gay
I’ve long associated vago (Ital. wandering, roaming) with vagus (Lat. vagina) for many years, and I have contemplated the metaphor of vagina as vagabond, but I never would have made the leap to gay, though I have to admit I’ve never referenced the etymology of that particular American English adjective. “The Deep Roots of Gaiety” is an etymology blog post by renowned Germanic philologist Anatoly Liberman, whom, I believe, when he speaks of deep roots, is making a subtle pun (see paras 6 [inline text] & 8), or not too subtle if you’re of a certain mind. Apparently some minds, like other parts of the anatomy, run deeper than others. 
"I take this picture of myself and with my sewing scissors cut out the face. Now it is more accurate; where my eyes were everything appears."
— Margaret Atwood (The Journals of Susanna Moodie)