The idea of the award is "to draw attention to the crude, tasteless, often perfunctory use of redundant passages of sexual description in the modern novel, and to discourage it." But I do think they confuse good writing about bad sex with bad writing. Mailer was writing about Adolf Hitler, so he must have meant the act to seem ugly. This conflation of bad sex and bad writing was really obvious in 2004 when they gave the award to Tom Wolfe a passage in "I Am Charlotte Simmons":
Wolfe's third novel is set in an imaginary elite Ivy League university and is seen through the eyes of his eponymous heroine - a shy, virginal country girl who is initially shocked by the decadence and excess she encounters. Wolfe spent four years roaming the campuses of America's top universities researching the novel and claimed in a Guardian interview that "I have tried to make the sex un-erotic. I will have failed if anyone gets the least bit excited. So much of modern sex is un-erotic, if erotic means flight of fancy or romantic build-up."I've read that book, and Wolfe did exactly what he says he meant to do.
Nevertheless, bad sex or bad writing, the chosen passages are quite hilarious.