Since these dwarf males pair, not with females, but with hermaphrodites, Darwin termed them “complemental” males.

The higher complemental parts, which are parallel to animal life, move more quickly, but yet without melodious connection and significant progress.

The two are complemental and necessary to each other.

It is easy to see that intellectually, as well as physically, men and women are complemental, and when the conclusions arrived at are identical they become confirmatory of each other.

He falls in love, not so much with what is ideally lovable in a woman, but what is practically complemental to his own nature.