How does one tell the difference between human males and females?

This is usually done between males to see which will become dominant.

For a female went only to the winner of a fight between males.

You have just described the relationship between males and females.

There is almost no size difference between males and females.

On the other hand, females do not choose between males.

Section 209 came into force when homosexuality between males became legal in 1971.

It is suggested that they may be used in sexual competition between males.

No differences in calls between males and females have been identified.

They particularly play a role during engagement between males and females.