Kindergarten Art Class
The man first shaves his pubic hair and saves the hair in a cup or some other container. After having sex, the man ejaculates on his partner and sprinkles his stored pubic hairs over the fresh cum causing it to stick. Much like glitter sprinkled over glue.
I gave my girlfriend a Kindergarten Art Class last night. She woke up this morning with my iniyials stuck to her belly.