Although, then, as for the question of, if the eyeball + nerve "is" Tama, can Tama's core body be penetrated: Probably no? At least not in a sexy way? Except that it did lead me down a rabbithole searching "why does rubbing eyes feel good" (answer unfortunately not particularly related to the contents of the eye, just to lubricating the surface of the eye).

Although, arguably, what is the seeing the visible light spectrum if not penetration of the eyeball? The pupil even dilates and contracts! Watching porn or someone else's masturbation when you're literally an/their eye is probably very much sex.