All my ex-boyfriends kissed me on the cheek while I was taking a selfie with them. I just saw a TikTok of a man doing the same thing to his girlfriend. Personally, I wouldn't even think of kissing him on the cheek while taking a selfie. Are they copying their fathers' behavior, is it a societal norm, or are they just following their instincts?
The same goes for when they put their hand on my leg while I'm in the passenger seat. I personally wouldn't even think of putting my hand on my boyfriend's leg while I'm driving. Why do they do that? Is it genetics?
It seems like a mate-guarding instinct to me. They want to show you as well as anyone else seeing the photos or in the car that you are taken. I don’t personally consider it a bad sign, but if your gut reaction is fear or disgust, then it’s time to dump him.
It can be a sign of possessiveness, in my opinion, especially if he starts doing it whenever you are around other men or taking pictures that will be seen by other people. If he feels the need to show that you are "his property" every time you see other men by showing them he has access to your body, he is seeking validation from other males.
If he reaches for your hand or shows other physical affection in public when there are witnesses he wants to impress, he is not showing his affection for you. He is marking his territory.
I'm not a fan of that kind of behaviour in general myself, because it signals that he feels entitled to touching me whenever he wants without checking with me and waiting for a "go ahead" signal first (which can be something simple like a gesture or quickly catching my eyes in an established relationship).
Constantly escalating innocent affection to groping or something sexual in public (e.g. moving the hand on your thigh towards your crotch, putting a hand on your butt, putting an arm around you and then moving his hand upwards to cup your boob, pushing his tongue in your mouth during a simple peck, pressing his crotch against you while hugging...) is also a no-go for me.
I imagine if they kissed you on the cheek while you were taking a selfie with them, it's because they surmised you would be posting the image to social media. As far as the hand on the leg while driving, I don't know. Probably just being affectionate. If you're not okay with either of those things, let the guy know.
"All my ex-boyfriends wanted to kiss my cheek. Why oh why oh why?"
-your post, paraphrased
Attention-seeking, low-quality, and low-intelligence posts like yours are the reason many users have left this site.
Those things are both R*PE and ABUSE, full stop.