My 4.5yr old told DH a "secret" on Tuesday, he said that a girl at preschool kissed him on the lips. He seemed to think it was something he couldn't tell me because I would get angry. DH doesn't think it's a big deal and I'm not really sure how I feel about it or whether there's anything I need to do. Eventually DS told me about it and he seemed embarrassed but also excited about it. I told him that he shouldn't try to kiss anyone at preschool but he said that SHE kissed him (on the lips). Would you do anything? What would you tell your son?