Do couples sometimes kiss to show off or is it insecurity or something else?

MissAM
I was invited to go eat with family today. I was sitting at a center table when another couple came in and was seated at a table right in front of me.

As I waited to place my order the man pointedly stared at me then began to make out with her (about a minute each time they kissed). I wasn't staring I was just facing their direction. I couldn't help but see them. It really appeared as if the reason he decided to start kissing her was... because he had an audience?

When they finally stopped kissing the first time he whispered to her then they BOTH looked at me. I really don't mind people who are in love showing each other affection. What bothers me is when they literally stare at you for a few seconds first.

This doesn't happen that often but I remember once 2 years ago I was at the drive through paying. I looked inside waiting for the cashier to come back to the window. The couple ordering food inside saw me waiting/looking in and all of a sudden they were very touchy then started to kiss. They stopped when I looked away. When I had to face them to receive my food they "suddenly" felt like kissing again.

So do couples sometimes show PDA in this particular manner to try making you jealous? To show off? Are they just a bit insecure? Or just suddenly feel like being affectionate and want others to see they are in love?

It bothers me a little because couples who want to be seen making out/kissing don't seem to be doing it because they are in the moment but simply to get a reaction.

And does this happen to anybody else (the staring directly AT you before the couple begins PDAs)? How do you react?
Do couples sometimes kiss to show off or is it insecurity or something else?
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