In King Lear, women are often seen as emasculating, disloyal, promiscuous, and the root of all the problems in the world. King Lear in particular has serious issues with women – when his daughters, Goneril and Regan, betray him, he begins a diatribe against women, particularly female sexuality, that echoes throughout the play.
When Lear's daughters betray him after he has given them his kingdom, he feels as though he has been emasculated – according to Lear, Goneril and Regan strip their father of his "manhood."
King Lear views female sexuality as horrific and terrifying and, since Lear believes that most women are promiscuous, he also believes that most women are monsters.