When Io is a cow, the oistros chriei, it “rubs” or “anoints” her… Its action may be implicitly pleasurable, or irritating, or maybe both. The verb may express male ambivalence over female experience of sexual desire-desire as torment.
Padel analyzes Io’s affliction by the oistros as a mythic encoding of female sexual desire experienced simultaneously as pleasure and torment, revealing Greek male ambivalence toward feminine erotic experience.
, In and Out of the Mind Greek Images of the Tragic Self, 1994thesis