Quoting Jenna+1:" <blockquote><b>Quoting The Doctor:</b>" When/if my children want to. No difference ... [snip!] ... I don't think it's gross or dirty."</blockquote> :!: ill still kiss my mom on the lips and so will my brother (30)"
I don't kiss either of my parents on the lips anymore, but I don't remember when we stopped. Maybe my mom every once in a while, but we usually do the big slobbery cheek kisses in my family. I just don't see an issue with a peck if it's between family members. :)
I'm guessing when they want to stop. I still kiss my mom on the lips, I only kissed my dad on the lips when I was a kid. So when/if they ever act like they don't want to anymore, then we'll stop.
I don't have rules for it. I let my children decide how they want to show their affection. One son was around 5 when I noticed that he started aiming for my cheek when he wanted a kiss. My middle son is 7 and usually kisses my cheek but every now and then gives a kiss on the lips. Then I have a 10 month old that loves giving me the big, sloppy, open mouth kisses that seem to cover half my face. :) I love kisses from my little guys...any way they want to give them.
My oldest son has just now started grumbling that's it weird to him at (almost) 10, so I won't anymore if it makes him uncomfortable. And my husband has never kissed any of them on the mouth, he personally feels weird about it.