Kissing parents on the lips

My boyfriend is 17 and he still kisses both his parents on the lips.. and I mean, I could understand his mom, but his DAD???

I was raised in a home where my parents never kissed me on the lips, ever, and as a result I think it's a little weird for parents to do so. (But it's also not my business what anyone does with their children so of course I keep my opinions to myself :)

Anyways, thoughts? Do you think it's odd for a 17 yr old boy to kiss his dad on the lips? Do you kiss your children/your parents on the lips?

I would also like to clarify that I understand there is no harm whatsoever in a small peck on the lips, I mean they do share DNA after all. 😅