P.G. Wodehouse: Jeeves in the Offing - Love and the Male Sex

In Chapter 12, while Bertie Wooster is conversing with his aunt Dahlia Traver about his past relationships with Roberta Wickham:

"The snag in this business of falling in love, aged relative, is that the parties of the first part so often get mixed up with the wrong parties of the second part, robbed of their cooler judgment by the parties of the second part's glamour. Put it like this. The male sex is divided into rabbits and non-rabbits and the female sex into dashers and dormice, and the trouble is that the male rabbit has a way of getting attracted by the female dasher (who would be fine for the male non-rabbit) and realizing too late that he ought to have been concentrating on some mild, gentle dormouse with whom he could settle down peacefully and nibble lettuce."