How "normalized" would you say ff is nowadays?

I know there for a while it seemed like bdsm stuff was getting popular and a lot of couples would do it as a spice things up act.

Im curious how common it is now to basically grab a girls foot during sex (if the position makes it easy) and start sucking on it or sucking on it during foreplay? I have the impression this is next to completely accepted and normal nowadays. Probably from pornography.

Something ive learned is ff is SUPER common, so many of my peers admit to it its really something.