Marcus Valerius Martialis, known as Martial (c. 38/41–102/104 AD).
From Epigrams (Latin: Epigrammae, c. 86–103 AD), Book 11, by Martial, translated by D. R. Shackleton Bailey, Volume 3, Loeb Classical Library (London: William Heinemann; Cambridge, Massachusetts: Harvard University Press, 1993). Footnotes omitted.
That you rub snow-white Galaesus’ soft kisses with your hard mouth, that you lie with naked Ganymede—it’s too much, who denies it? But let it be enough. Refrain at least from stirring their groins with your fornicating hand. Where smooth boys are concerned, the hand is a worse offender than the cock; the fingers make and precipitate manhood. Hence come the goat and rapid hairs and a beard to make a mother marvel, hence baths in broad daylight displease. Nature divided the male: one part was created for girls, one for men. Use your part.