My cousin's 3 year old daughter tried to pull my shorts down when we were play fighting. She thought it was hillarious. I did not find it funny. The prospect of being found alone in a room with my shorts down with a 3 yr old. Not cool.

Also knew a kid who would lie about being smacked. If he wanted something and I wouldn't give if to him, he would start crying. Then when his parents would come to see what the fuss was about, he would point at me and say "He beat me hard". Thankfully his parents caught on early cause they had a baby cam...lol

But kids get a kick out of your discomfort sometimes. Lol
Its weird but they look to push the boundaries to see where the line is.
Liking your penis is safe to say is where the line is drawn.