But I cannot wait - for reasons purely biological - any longer.

It was purely biological.

Love has many different definitions ranging from a set of purely biological and chemical processes to a religious concept.

I have explained that some of these values are purely biological, including perhaps eroticism, to which psychoanalysis attaches so much importance.

"The fact that I'm a woman is purely biological," she said in an interview with The Associated Press in 1983.

Only in the human world, and then solely in the social context rather than the purely biological, has this process been reversed.

As a he politician, worked to improve health of Berliners including water and sewage systems--"Disease never purely biological, often socially derived."

She views winning the contest as a mechanical, purely biological function, "no big deal" as her mother has told her.