PDA's and kissing in public
In my view yes !! so long as you are not trying to vacuum clean someone's mouth. The trouble is there has been so much social conditioning that we forget how to live. We only have a short time on this planet, so if you love your partner and want to kiss them in public go ahead.
Life has a nasty habit of pulling you down, and we can become withdrawn. We forget how to love and who we love. If you love your partner and your partner loves you I see nothing wrong with holding hands and a nice kiss on the lips.