Love in the presence: The many constructs of the Ménage à Trois     Seeing, or being seen in the act, was not invented by the Greeks . . .        . . . but they did invent the virtual threesome.     An Indian scene left out of the Kama Sutra.     Nothing solitary about this pleasure, Japanese style . . .     . . . or were they here too inspired by the Chinese, as in much else?     While in the west, all is innocence . . .     . . . were it not for Mr. Warren and his wine cup.		The Warren Cup