Why do people openly display affection in public?

like kissing and all that mushy gushy stuff. is it because youre insecure about your relationship that you feel need to flaunt it in everybody else 's faces.? people need to learn to keep their love life private.these PDA obsessed people are the same people that whine about people being in their buisness and trying to ruiin their relationship. WELLLL they woudnt be in your buisness if you werenly so open about it and flaunting. FB relationship status's should also be set to NOTHING. not single nor in a relationship if you dont want nosy people all in your buisness.