"Therefore, broadly speaking, males invest less and seek quantity of mates, while females invest more and seek quality of mates."

“As every bird-watcher knows, the beauty of a bird's song is inversely correlated with the colourfulness of its plumage.”

“...compare mankind with other animals that share our highly social habits: with colonial birds, monkeys and dolphins. As we shall see, the lesson they teach is that we are designed for a system of monogamy plagued by adultery.”

“Life is a Sisyphean race, run ever faster towards a finishing line that is merely the start of the next race.”

“People are attracted to people of high reproductive and genetic potential -the healthy, the fit and the powerful. The consequences of this fact, which goes under the name of sexual selection, are bizarre in the extreme.”

“Evolving is not a goal but a means to solving a problem.”

“In behavior, as in appearance, every human individual is unique.”