Requesting hard data hardly qualifies as situational ethics, unless you assume the scientific method to be just an exercise in situational ethics.
You can’t demonstrate the kind of damage done to a child, which is what a 12 year old is, by this kind of encounter *scientifically* unless it’s diagnosing the diseases he may have picked up.
The harm from this kind of abominable encounter cannot be reduced to mere numbers and statistics.
Looking for scientific evidence that harm was done before determining that it was wrong is just looking for excuses to justify it.
There are absolute right and wrong, moral absolutes, and they don’t need any statistics or data.
It is morally wrong for an adult to have sex with a minor. If the adult is a man marrying a younger woman, in some cultures and at some time periods, then it is acceptable, depending on the age difference. Many people on FR have said that their grandparents were married as teenagers, or their grandmother was even 14 or 15 when she married a young man in his 20s.
But that is marriage, not illicit sex, and it makes a huge difference.
There is no need of “scientific method” to determine moral absolutes. It is wrong to murder, to kidnap, to slander or libel, to rape, to molest children, to commit incest or bestiality.
No need of studies, statistics or comparison charts.