By the data to date, there is only one animal in the Galaxy dangerous to man -- man himself. So he must supply his own indispensable competition. He has no enemy to help him.
Robert A. HeinleinWomen and cats will do as they please, and men and dogs should relax and get used to the idea.
Robert A. HeinleinGeniuses and supergeniuses always make their own rules about sex as on everything else; they do not accept the monkey customs of their lessers.
Robert A. Heinlein