No kidding. Were I the father, spending 10 years in jail would be the least of that boy's worries.
It was consentual though and ten years is a long time in prison.
Unless the laws become more "age sensitive," I'd say it'll remain that way. I'm sure no-one would rise to this guy's defense if he'd been 28, 38 or 48 and having sex with a 15-year-old girl.