No Brain, no appreciation of sexual feelings.

What is a reflex? A hard-wired circuit in the spinal cord.

Inputs to Reflexes

Brain: erotic fantasies, memories

Sensory input

Touch

Vision

Smell

Taste

Audition

Controlled by dual input of the sympathetic and parasympathetic

components of the nervous system.

Erection = parasympathetic activation

Ejaculation = sympathetic activation

Excitement Phase (erection in males)

Plateau Phase

Orgasmic Phase (ejaculation in males)

Resolution Phase

Aphrodisiacs

Spanish Fly, Alcohol, Marijuana, Cocaine, Nicotine,

Amy Nitrate, Yohimbine

Anaphrodisiacs

Saltpeter, Opiates, TESTOSTERONE