My ex partner is totally freaking out over my daughter who is 19 mo. old (his daughter ) kissing her brothers ( 9, 11,12 ) goodnight on the lips 
I see nothing wrong or perverted in this - they're kids for goodness sake...
He wants me to stop them doing this & says everyone he knows thinks it's wrong.....is it wrong ??
kids that age do kiss on the lips thats what they know are kisses... that one kisses with the lips so they see yours and will kiss yours.. later when they have a broader understanding of society do's and don'ts they'll know to choose a different way to express this affection (at least on the cheek i mean 
) but at 19 months is way too young to have this sense of themselves and others. she's just fine. the other person is the one thats less open minded and frankly a bit uptight.. (meant in love honest )
She's a baby, what's a little slobber among siblings....or Grandma, Poppa, etc. 
Of course there are two sides to everything:
http://www.parentdish.com/2006/02/08/do-you-kiss-your-kids-on-the-lips/
http://ca.answers.yahoo.com/question/index?qid=20070508162317AAlZQzc
HTH
I told him they would probably just kiss on the cheek when they're older ( my 18 yr.old kisses her on the cheek ) & it's normal - they love her to pieces & she them
Ever since she was born , he's been carrying on about me having to watch them around her - in case they " do something " ( I find his insinuations very insulting )....I can't believe he would think like that....
Thanks Doug - I'm glad not all men think like that !
My one daughter will always kiss close family on the lips but my second will only give her forehead for any of us to kiss her and even then she might wipe it off.
She is still very young, she will eventually out grow this. I don't think you should worry too much about this.
I don't think there is a problem with this at all. They are young and do not have the same thoughts as older children / adults. Their kisses are very innocent and from the heart. As everyone else has mentioned, once they get a little older they will more than likely stop kissing each other on the lips as they'll think "ewwwwww girl / boy germs" . 
I think its fine It really depends on how the older child feels my DS is 7 he doesnt want to be kissed by anyone on the lips so he offers his cheek to me and his little sister. my 3 your old DD loves to give kisses and freely kisses DH and His dad but my dad doesnt like it along with my brothers they want to be kissed on the cheek and thats fine to its all a show of love and that the child is comfortable around them. Im positive the older boys are not thinking anything wrong by being kissed by there little sister I think you ex is the one with the dirty mind that this would even enter into his head.
All 3 of my children give kisses on the lips. My son who is three years old gives kisses on the lips to close family but to friends he will kiss them on the cheek. My 2 year old daughter gives kisses on the lips (if she feels like it, she has a mind of her own)
And my 1 year old does the same thing. I do not find it wrong or perverted. I think they are kids and they show affection how they want to.
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