Baphomet's Eye is one of the magical items described in Monster Girl Encyclopedia World Guide III: Sabbath Grimoire.
Guide Book Entry
"Baphomet's Eye" is a gem-like spherical magic tool that imitates a pupil, that gives its possessor "the power to ascertain a suitably strong human with the qualities to become a witch". The power to see witches' qualities is said to be one of the powers held by the race "Baphomet". This magic tool was created by the Sabbath's head Baphomet by transforming her own power into crystals. Witches carrying out solicitation activities are given this item by a Baphomet. To those who possess the power of this magic tool things like, "a woman clad in stronger corruption by gaining a childish figure", "a woman whose desire is to become a young girl to be protected by men, and whose true nature is meek and desires dependence", "a woman who holds a strong aptitude to manipulate mamono mana in the form of magic" can be understood just by seeing them.
Moreover, should a human come to possess this magic tool, be they male or female, when they see a young girl in their eyes, it seems they come to find sexual charm in that youth. Also, even if they should see a mature woman, it is said you can easily picture what she looked like as a child. Surely you will become acquainted with "Baphomet's Gaze". To the eye seeing a mamono of childish figure entrusting their body to a man, and the figure of drowning in pleasure, even though it should be socially despicable, that state of corruption seems joyous and ideal. They will be dyed to an appropriate heart as a person welcomed by Sabbath.