You started the conversation with the statement that your 3-year-old son already knows the biological difference between girls and boys. That led you to ask him what I am. He replied that he thought I was a girl. You told me that you corrected him as to my gender, and he replied, "He must have a really big penis!" We both laughed. That led me to make a joke that my member's size is adequate to the task. Given that we were in the children's play area of our neighborhood coffee shop, you shushed me. Lady, stop using your son to find out if a guy wants to fuck you. Just be an adult and ask for it.