Do those things really feel that good? That gag even appears in Ultraman of all places.
Not really. It's just combination of 'you never felt that kind of stimulus' and 'your hair kind of prevents direct contact with scalp' thing that makes you feel ticklish when using it.
Maya's heard one can become an adult lady by using the metal shower thingy!Maya too! Maya wants to do it too! Please, Trainer-chan!Ooh... so the metal shower fweels likesh dis... Maya's stumblesh across the truth, maaybessh...