sex ratio
性比
Evolution of sex
Operational sex ratio
Sex allocation
Trivers–Willard hypothesis
XY sex-determination system
Humans:
Human sex ratio
List of countries by sex ratio
Bride kidnapping
Groom kidnapping
Demographic transition
Sex selection
Sex-selective abortion and infanticide
Youth bulge
Institutions:
Gender Balance Council
/suto3/google.iconsex ratio
image sex ratio
define sex ratio
wikipedia sex ratio
weblio sex ratio
kotobank sex ratio
jisho sex ratio