Each is differentiated by the sexual behavior between mates, such as which males mate with certain females.

Also, intersexual selection, or mate choice, occurs when females choose between male mates.

There was always that sort of chivvying between mates on a vessel.

The ground rule: an age disparity of at least eight years between mates.

The result was an affecting dramatization of the bond between unlikely soul mates.

They lost all generosity, and anger was general: there were bitter disputes between friends and mates, even violence.

"Sharing energy is part of the bonding between mates."

I've heard of many such bonds between mates in many species, including, as we know, the Andorians.

An interpretation of this behavior is that it strengthens the pair bond between mates.

The link at times like these between captain and mates was drumhead tight.