I can tell you why. Male sex offenders are inherently more physical, or at least expected to be. It’s the same reason why rape in many places can only be committed by a man. There’s absolutely female pedophiles and predators, but people either ignore them, or don’t look hard enough to see them. My own personal theory is that female pedos are just as common as male, but the way they get sexual gratification is different so evidence is more common for men.