In this speech, Lear is expressed his hatred of women, a hatred brought on by the way his daughters Goneril and Regan have treated him. They have betrayed him, lied to him, and treated him so disrespectfully that we as an audience can understand his anger.
Here, Lear is trying to convince those listening that, below the waist, women are nothing but animals, driven by sexual lust. To make his case, he uses vivid imagery. Images use the five senses—sight, sound, touch, taste, and smell—to convey a picture. Lear points to a woman he sees and calls her a "simpering dame" and says she "minces." Simpering and mincing are not pleasant images, as they suggest using fake facial expressions and a fake way of walking to lure a man to sex. Lear also uses such images as "soiled horse" to describe what women are like sexually. This is not a pleasant image. He says too that women's lower body parts belong to "the fiends." Again, fiends or devils are unpleasant symbols. Lear is trying to persuade his audience that women are repulsive creatures that men should stay away from sexually.
Lear also uses metaphor to make his point. Metaphor is a comparison that does not use "like" or "as." Lear likens women's sexual organs to "hell," "darkness," and "the sulfurous pit," using off-putting descriptors like "scalding" and "stench." If his audience takes him seriously, they will stay far from sexual relations with such creatures!
Lear also uses exclamatory expressions to reinforce his point, saying, "Fie, fie, fie, pah, pah!" This is a rhetorical device because it emphasizes that he means what he says.
Finally, Lear states that, with what he knows of women, he needs "civet," or an artificial stimulant, to get his imagination in the mood for sex: certainly his understanding of women would not make them desirable to him on their own.
Lear's attitude toward the female sex couldn't be bleaker at this point. Later, as he realizes Cordelia loves him, his misogyny will soften.