DEAR HARRIETTE: My 15-year-old son came home late from a party with his friends. In the morning, I noticed that he had a hickey on his neck. Now, I am no prude, but I’m also no dummy. I need to remind him of how to protect himself, but when I attempted to talk about it, he brushed me off, saying it wasn’t a big deal. If he is old enough to sneak out and get a hickey, I think he is old enough to ha…