1. Please show that seeing two people, no mtter what their gender, showing affection for each other is "bad for children." Cite your sources.
2. Holding hands or an innocent peck on the cheek is fine, no matter what the respective genders of the people involved are. "Making out," in my opinion, is crossing the line, and is rude, again, without regards for a person's gender.
But...here's your answer - No. Nobody has the right to single homosexuals out and make laws which restrict only their behavior. Sorry...you lose.