Lecture 2

Question 1

Penis Size Importance

Answer 1

historically, good genes + stimulation

Question 2

sexual selection

Answer 2

survival vs mating success eg. peacock tail

Question 3

intrasexual vs intersexual

Answer 3

intimidate rivals vs attract mates
prause 2015
penis morphology

Question 4

functions of the penis

Answer 4

sperm delivery /removal (damselfly and Gallup 2003)

Question 5

Increasing penis size

Answer 5

increasing length (cutting tendon) vs increasing size (liposuction vs dermal fat graft)

Question 6

Sperm Competition

Answer 6

impacts testes size and amount of sperm 
gorillas 
Fitzpatrick 2009 fish
insects
pitnick 2005

Question 7

Sperm Cooperation

Answer 7

fisher 2014 - hooks and sperm trains

fisher and hoesktra 2010 mice

Question 8

Female role

Answer 8

pizzari and birkhead 2000 - wild chickens

human comparison