The Beauty of Fertility and a Good Immune
System
•
Preference for younger features on female
•
Preference for masculine men
(testosterone-related facial features) for
casual sexual encounter, less masculine
men for long-term partner
•
Smell preference for an immune system
different from our own (dissimilar MHC
genes)

Beautiful Female Faces Are
Symmetrical and Youthful

Smell & Attraction
Sweaty T-Shirt Re-enactment


A tale of two rodents…
Prairie voles are
monogamous and
nurturing.
Mountain (Montane)
voles are promiscuous
and not nurturing.
Only ~5% of all mammals are monogamous

A4w--HP7tc
Oxytocin Receptors and Pair
Bonding


PL PFC
NACC
Density of
Oxytocin
Receptors
Effect of
Oxytocin
Antagonist on
Partner
Preference
Social
Chamber

Hormones and Mating Strategy
Oxytocin
: neurohormone secreted
during child birth, lactation; promotes
pair-bonding
•
Expressed more by females
•
Released during orgasm by both
sexes
Vasopressin
: neurohormone
important for social behavior, sexual
motivation and pair- bonding
•
Expressed more by males
OT
OT
VP

This is your brain on Love…
Dopamine
up: more pleasure and
motivation, less sadness
Oxytocin
up: more trust and attachment,
less fear
Vasopressin
up: more arousal, attraction,
less anxiety
Serotonin
down: more obsession and

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- Fall '19
- Sex organ