Robert A. Heinlein Quotes

It makes you realize how basically everything we do comes down to a) mating or b) competing for resources. It’s just like Animal Planet, only we’ve got Cover Girl and Victoria’s Secret instead of colored feathers and fancy markings, and the violence occurs at the Nordstrom’s Half-Yearly Sale.

I wonder if most people ever ask themselves why love is connected with reproduction. And if they do ask themselves about this, I wonder what answer they give.

There are 7 billion people on the planet. Pretty much everyone is doing sex. It's not like you need to order the "baby-starter kit" on Amazon. Instincts will come to you at the weirdest places and times.

Considering the way evolution works, it should not be surprising if every man has got a Don Giovanni somewhere inside him.

It is essential that we realize once and for all that man is much more of a sex creature than a moral creature. The former is inherent, the other is grafted on.

Apart from anything else, I am designed by evolution, like we all are: if we see a little thing like that, big eyes, tiny nose, we go 'aaah'. That's what evolution does. We are programmed to do that. So to find babies the most amazing, isn't surprising, I don't think.

Beauty is the bait which with delight allures man to enlarge his kind.

I say you don't need religion, or political ideology, to understand human nature. Science reveals that human nature is greedy and selfish, altruistic and helpful.

Somewhere between the intellectual idea of why we're attracted to certain things and the pragmatic reality is some form of ever-evolving truth.

Man is primarily governed by passion and instinct.

I think romantic love evolved to enable you to focus your mating energy on just one individual at a time, thereby conserving mating time and energy.

Evolution has programmed our brains to find two things particularly interesting, and therefore memorable: jokes and sex - and especially, it seems, jokes about sex.

All human actions have one or more of these seven causes: chance, nature, compulsions, habit, reason, passion, desire.

Reason is the historian, but passions are the actors.

Two things control men's nature, instinct and experience.

Concupiscence and force are the source of all our actions; concupiscence causes voluntary actions, force involuntary ones.

Almost nothing is known from hybridization studies about the inheritance of courtship behavior of females, or of their responsiveness to particular male signals.

Economic man and sensual man are not suppressible.

It is futile to go against human nature.

There's something about trying to figure out why someone is doing something that on the outside is horrible - what drives them to do that? What could drive any human being to that kind of behaviour?

When you start to think about the drives that humans have, I think sometimes we find we are simpler than we thought and more easily manipulated.

Evolutionary psychology offers a parsimonious framework for understanding which domains are likely to yield sex differences and, if so, in which direction.

Evolutionarily speaking, there is seldom any mystery in why we seek the goals we seek — why, for example, people would rather make love with an attractive partner than get a slap on the belly with a wet fish.

If insemination were the sole biological function of sex, it could be achieved far more economically in a few seconds of mounting and insertion. Indeed, the least social of mammals mate with scarcely more ceremony. The species that have evolved long-term bonds are also, by and large, the ones that rely on elaborate courtship rituals. . . . Love and sex do indeed go together.

Human action is governed largely by instinct and emotion.