Everyone should read The Crimson Petal and the White by Michael Faber.

From page 73:

And so the passing strollers in St James's Park are transformed unwittingly into sirens, and each glowing boy becomes suggestive of its social shadow, the prostitute. And to a blind little penis, swaddled in trousers, there is no difference between a whore and a lady, except that the whore is available, with no angry champions to deal with, no law on her side, no witnesses, no complaints. Therefore, when William Rackham finds himself possessed of an erection, his immediate impulse is to take it directly to the nearest whore.

Not that I approve of the implications here, but men are so refreshingly simple at times. :P