According to Tom Burnam's
Dictionary of Misinformation, a common misconception about eunuchs is that, since they were castrated, they were either unable or unwanting to defile or perform
sexual intercourse with the women in the harem they were employed to watch over. This was not always true, however. Though they would be expected to have a lower sex drive, eunuchs could often achieve an
erection and engage in
coitus, though no pregnancy could result. According to Burnham, some women preferred eunuchs as lovers since they never
ejaculated and could, therefore, maintain erections longer.