the human penis has evolved as a tool to stimulate the vagina and cervix so oxytocin is released into a woman’s brain. The bigger the penis, the more effective it is at triggering an oxytocin surge during intercourse. Surges of oxytocin help ease any apprehension or anxiety a woman may have, making her open to her lover’s emotional and social cues. She takes in his face and eyes and powerfully registers the emotional context in her amygdala. Presumably, dopamine and opioids are released. While she stares at her lover in a way that would be disconcerting in other contexts, she receives
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