Anyone else kid do this?

Just really curious if this is specific to my kid. He really loves to smell my feet, like ALOT. Multiple times a day especially after work. lol I get they are sensory sensitive. It both cracks me up and also makes me worries me a bit. Just curious if I am the only one with a feet smeller. For some background he is almost 9 and he has been doing it his entire life, I think it stems from my mom smelling his feet as a baby and going “stinky feet stinky feet) as a way of playing with him. And now he may do it as a sign of affection. I’m not really sure just curious if I am alone.