Son asked girl to show him hers for $20

On the last day of school, my son (K) offered a classmate $20 to show him her "vulva." Just found out today, and my wife and I are mortified. He got caught playing "I'll show you mine if you show me yours" consensually with a classmate earlier in the year, which is developmentally appropriate. He's certainly interested in how bodies work!However, he is still learning about personal space and private areas. He isn't really into money, doesn't really grasp the concept of the transactional nature of exchanging money for goods or services. And he CERTAINLY doesn't understand the implication of offering money in exchange for things of a sexual nature (ie prostitution)I have my suspicions that he was put up to this by another classmate. He's pretty aloof and a bit of a people pleaser, meaning, he'd pretty much do anything someone asked him to if it improved his friendship with them. I'm seeking advice and resources on how best to address this with him. via /r/Parenting http://bit.ly/2NcUXy3