MY DD had this problem when she was that age. It made her very un-popular after awhile. Baby Phat is right, teaching about personal space is very important. I know it was very hard to explain to my DD about the kissing...after all she loved us and got to kiss us when ever she wanted...she loved her friends and wanted to hug and kiss them as well. What helped was to give her ideas on how to show her friends she liked them with out kissing and hugging.