Then what of the biological imperative?

Those aren't biological imperatives.

What's happened to the male biological imperative?

As he suggests, biological and psychological imperatives may well take different forms.

Costa is an authority on biological imperatives which frequently drive economic, political and social agendas.

It had something to do with natural biological imperatives according to the other ones he'd talked to.

For instance, Leetah's parents were close for some time before they Recognized, and they immediately complied with the biological imperative without any argument.

The biological imperative isn't driving us anymore; these bodies are sensory receptors for our consciousness, nothing else.

It was perhaps the ultimate maternal conflict: choosing between the biological imperatives for self-preservation and procreation.