These are the most frequently used words in this book.
1977
1988
1993
activity
adult
al
although
among
apes
baboons
behaviour
between
body
brain
case
changes
chimpanzees
competition
control
copulation
copulatory
cycle
data
days
development
differences
displays
dixson
during
effects
ejaculation
et
evidence
example
exhibit
female
fig
frequencies
gorilla
groups
hormones
however
human
individuals
intromission
levels
macaca
macaques
male
marmosets
mating
may
mean
mechanisms
might
monkeys
mounts
new
number
occur
ovarian
partners
patterns
penile
penis
period
phase
possible
primates
proceptivity
prosimians
rat
reproductive
response
result
rhesus
role
selection
sex
sexual
sexually
shown
size
skin
social
species
sperm
studies
success
swelling
system
table
testosterone
time
two
upon
various
whilst
world
years