Adam Clarke on Joel 3:3

Have given a boy for a harlot - To such wretched circumstances were the poor Jews reduced in their captivity, that their children were sold by their oppressors; and both males and females used for the basest purposes. And they were often bartered for the necessaries or luxuries of life. Or this may refer to the issue of the Chaldean war in Judea, where the captives were divided among the victors. And being set in companies, they cast lots for them: and those to whom they fell sold them for various purposes; the boys to be slaves and catamites, the girls to be prostitutes; and in return for them they got wine and such things. I think this is the meaning of the text.