Athena's always been my favorite Greek goddess (to the point that my webcomic character is purposely a modern Athena, as Flash is a modern Hermes, Superman a modern Heracles, Sub-Mariner a modern Poseidon, etc.) but to tell you the truth, it never even occurred to me that Athena might be a lesbian. I always took that thing about her chastity as gospel, no matter how unrealistic it is. But you're right, most Greeks wouldn't consider lesbian sex "real" sex. Hmmm. Nike. Pallas. Maybe...
Although a stronger case could be made for Atermis and her what, fifty nymphs in her retinue?
Ah, Daily Scans, like scans daily, always opening up new areas to speculate sexually about...