The part of your brain that handles sex frequently gets cross-wired into other, seemingly irrelevant areas at this age. This is when people pick up an orientation towards sexual dominance or submission, or when a lot of guys pick up highly specific kinks—say, rubber, feathers, or shoes. Some of them are unfortunate enough to get turned on by little kids, and those guys are essentially doomed from that point onwards—there is nothing to do except castrate them or lock them up. No therapy will unkink the brain once it has kinked.