That's the only Anime i've seen that actually show that, as for the rest it's only mentioned in gags where a father wants to bathe with his teenaged daughter.
anyway there are reverse situations. You never see in an anime two friends kiss each other in the cheeks, you rarely see them hugging, unless it is a very dramatic scene or the character is blatantly abnormal. In many western cultures a kiss or two on the cheeks is a way to greet a person that is very close to you (usually it's done by females or male and female, but between males is also accepted in some countries)
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