Nowadays, intelligent girls who are good at studying are not only interested in math and English, but also in erotic studies. These girls will show off the erotic knowledge they have acquired to everyone. In the sex education to arouse men, they show off their erotic bodies and demonstrate masturbation. In the sex education to make men feel good, they use the techniques they have learned to caress the man's sensitive parts while teasing him. And in the sex education to make both men and women feel good, they use each other's genitals to feel each other.