It is the mind that speaks a woman's heart, not the vaginal walls.

It is the mind that speaks a woman's heart, not the vaginal walls.

In 'Packing for Mars,' I tried to convey the importance of getting young people interested in science.

The writing is always the easy part, provided I can get the good material. It's the getting of the good material that's a challenge.

Viagra does have a physiological effect, but it doesn't make women feel aroused. Nowadays, researchers are looking at drugs that affect the central nervous system rather than blood flow to the genitals.

Yes, the money could be better spent on Earth. But would it? Since when has money saved by government redlining been spent on education and cancer research? It is always squandered. Let's squander some on Mars. Let's go out and play.

Sexual desire is a state not unlike hunger.