Just Inside The Peehole

The other day, I spread my peehole open so I could access the first few millimeters of the inner surface. I then started very lightly touching that inner surface with a dull sewing needle. It was subtle, but an interesting new sensation. It didn't make me cum, but led up to a great orgasmic experience. I think a woman could do this also but it might be more difficult. Have you ever done anything similar?