I thought this would be about Blackberries.
Holding hands, quick kiss is fine. Even the feeding of the cheesecake could be cute.
But body grabs and beyond shows a lack of respect for self and others. Tho the thrill of getting caught can add to the fun. Depends on the situation. I've told teenagers off when making out in front of little kids.
I have a similar beef with women who put makeup on in public: doing so is just a reminder to others that you need it. Get ready before you walk out the door--noone looks stylish trying to paint their face.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh