I believe Katie Hopkins when she says that one third of 14 and 15-year-olds are sexually active. That was the case in her day and mine, so I have no doubt that it is the case today, too.
But it is not an argument for lowering the age of consent, any more than the existence of drink driving is an argument for the abolition of the drink driving laws.
Of course Adam Johnson's victim will have had more or less the body of a woman. That is precisely why we have an age of consent, to give people's minds the time of catch up with their bodies.
Hopkins, an avowed Brexiteer, also argues, as do many people who post comments below the line on articles relating to this issue, that there are lower ages of consent in several other EU member-states.
In fact, the situation is more complicated than that. There is probably nowhere that Johnson would have been off the hook, and certainly not the France and Germany that are usually cited.
But that is beside the point.
If sex between adults and 15-year-olds is indeed, under certain circumstances, less seriously criminal in some other EU jurisdictions, and if that is being held up as a reason to make it so here, then it is impossible to imagine a stronger argument for withdrawal from the EU.