Gaius Caesar Augustus Germanicus (b. A.D. 12, d. A.D. 41) became emperor in A.D 37. His was one of the most notorius and yet poorly documented reigns. As a boy he was nicknamed Caligula, which means 'Little Boots', by the men in the army, as he went about dressed in a soldier's uniform with matching miniature boots. He was said to be extremely cruel and his characyer appears to be that of a true psychopath. He had people executed for practicaly next to nothing, confiscated people's wealth for himself, imposed outrageously silly laws, had incestuous relations with his sisters, etc. Whatever nasty thing you can imagine, Caligula probably did it.
Suetonius provides us with plenty of gossip about Caligula, and a very intriguing paragraph on his sex life:
"He had not the slightest regard for chastity, either his own or others', and was accused of homosexual relations, both active and passive, with Marcus Lepidus, also Mnester the comedian, and various foreign hostages; moreover, a young man of a consular family, Valerius Catullus, revealed publicly that he had buggered the Emperor, and quite worn himself out in the process. Besides incest with his sisters, and a notorious passion for the prostitute Pyrallis, he made advances to almost every woman of rank in Rome; after inviting a selection of them to dinner with their husbands he would slowly and carefully examine each in turn while they passed his couch, as a purchaser might assess the value of a slave, and even stretch out his hand and lift up the chin of any woman who kept her eyes modestly cast down. Then, whenever he felt so inclined, he would send for whoever pleased him best and leave the banquet in her company. A little later he would return, showing obvious signs of what he had been about, and openly discuss his bed-fellow in detail, dwelling on her good and bad physical points and commenting on her sexual performance. To some of these unfortunates he issued, and publicly registered, divorces in the names of their absent husbands."