[Gaius (Caligula)] never missed a chance of securing loot: setting aside a suite of Palace rooms, he decorated them worthily, opened a brothel, stocked it with married women and free-born boys, and then sent his pages around the squares and public halls, inviting all men, of whatever age, to come and enjoy themselves. Those who appeared were lent money at interest, and clerks openly wrote down their names under the heading 'Contributors to the Imperial Revenue'.
I was going to do an image search for "Roman prostitute", but I thought better of it. Here's an Italian dog instead:
And, of course, he's a puppy.