Ginny really didn't want to tell Luna the truth because she would know it turned Ginny on to touch herself like that. She didn't lie yto her friends so she sheepishly admitted, "because it's like sex, I mean, sexual. You know?" she asked Luna, hoping she did know.
A little releived Luna kept mentioning boys , she shook her head, "no but Mum told me their penis do and they rub them to feel better."