Why would any sensible man pay a 19 year-old for nothing but companionship unless he's the same age, looking for a date, and paying for a meal, not cash for her company. I would think that most 19 year-olds do not have enough knowledge to be worth spending time with except in those circumstances. After they have graduated (and graduated well) from uni and are in their mid to late 20s then that's different, not that I would ever do it, but at least they have enough to be good, sexless company if that's what the man wants.