'Virility' in the Bible

Reuben, you are my firstborn,my strength and the firstfruits of my virility,excelling in prominence, excelling in power.

He must acknowledge the firstborn, the son of the unloved wife, by giving him two shares of his estate, for he is the firstfruits of his virility; he has the rights of the firstborn.

And smote all the firstborn in Egypt,The first issue of their virility in the tents of Ham.

And he struck down all [the] firstborn in their land, [the] first of all their virility.