Do you really think kids are outwardly grossed out by their parents affectionate behavior? I don't necessarily see it that way, but that's probably because I grew up with my parents being very openly affectionate in front of us (hugging, kissing, some slight groping, pats on the but etc)....and yes that was comforting (wish they were still that way today)....but for me that taught me that behavior was healthy, good, and part of a loving relationship.
OTOH....My H wasn't raised in a household with outward affection. His parents kept everything like that to their bedroom, at night, behind closed doors....so he was never taught that behaving that way is good and healthful, which is probably why in the past he has sought out very sexually controlling women.
I'm sure you are right though that many kids do at least feign disgust when their parents get all mushy in front of them
