Alright. So. WE all know quite well that Voldemort never loved, but he is still human... mostly. And when he was younger, he was in fact fully human. Now, a human 16-15 year old boy, I'm sure would have... erm... urges. And, I think that Tom, being someone who wants to seem in control and powerful, may take pried in a trophy girl. Is it plausible? As well, I can quite imagine said girl being fully aware of this, and merely using Tom as a link to the power he has over people.