The normalization of slapping your wife's/girlfriend's arse every chance you get

Context:
- I'm a child of the 80s
- I regularly slap my wife's arse & did so to girlfriends before her from HS until my wife/now.

I cannot for the life of me remember my parents let alone my grandparents every slapping arse. And to think about it just feels really unrealistic that it ever happened.

If you are on any social media over the last 5-10+ years we are conditioned to know that slapping dat arse is something we all do, it's just normal in a healthy relationship as 100,000s post about it.

So, we're my parents & grandparents in unhealthy relationships? Will our kids know & realize that we are in healthy relationships? Or was there some previous form of arse slapping we don't seem to realize/context & what will be the future form of arse slapping...?