The Human Animal
BIO1300 – The Human Animal
External Fertilization
BIO1300 – The Human Animal
Internal Fertilization
BIO1300 – The Human Animal
1
Copulatory Organs
BIO1300 – The Human Animal
Birth on Land
BIO1300 – The Human Animal
Amniotic Egg
BIO1300 – The Human Animal
2
Avian Incubation
BIO1300 – The Human Animal
Avian Monogamy
BIO1300 – The Human Animal
Male Reproductive Anatomy
BIO1300 – The Human Animal
3
Female Reproductive Anatomy
BIO1300 – The Human Animal
Genital Development
BIO1300 – The Human Animal
Placental Gestation
BIO1300 – The Human Animal
4
Unequal Investments
BIO1300 – The Human Animal
Sex Role Reversals
BIO1300 – The Human Animal
Parental Investments
BIO1300 – The Human Animal
5
Reproductive Asymmetry
BIO1300 – The Human Animal
Human Contributions More Equal
BIO1300 – The Human Animal
Choosiness
BIO1300 – The Human Animal
6
Benefits of Polyandry
Indirect/Genetic
Direct/Material
Fertility Insurance
More Resources
Good Genes
More Care
Genetic Compatibility
Better Protection
Reduced infanticide
BIO1300 – The Human Animal
Female Control Over Paternity
BIO1300 – The Human Animal
Role of the Female Orgasm
●  Not
necessary for conception
contractions act as a
suction pump
●  Occur in higher frequency
when women have
intercourse with high quality
males
●  Assures paternity from
desired sires
●  Uterine
BIO1300 – The Human Animal
7
Role of Male Masturbation
Pleasure and practice
Sperm have a short
lifespan
●  They are in a line-up in
epididymus of
seminiferous tubules
●  Periodic ejaculations are
required to ensure fertility
●  If not manually purged,
then automatically done
(nocturnal emission)
● 
● 
BIO1300 – The Human Animal
Sperm Competition
BIO1300 – The Human Animal
Primate Body, Penis and Testicle Size
Female
Chimpanzee
Human
Orangutan
Gorilla
BIO1300 – The Human Animal
8
Phallocarp
BIO1300 – The Human Animal
Questions?
BIO1300 – The Human Animal
9