Why European nations outbreak faster than any other countries?

Because it spread over Europe before they knew what to do about it. The question is why is it having such an effect on the US when our government had advance warning... never mind I know, Trump and Republicans wasted too much time thinking it was a left wing hoax. 

I don't think Italy spread faster than China? It has to do with population density. The USA is pretty spread out but we just exceeded China...

Italy because it was a particularly high tourism time with Alpine skiing, Carnevale and Milan Fashion Week in addition to the usual tourism. All of those draw from all over the world and people are in close quarters.

Cheek kissing is a standard greeting throughout Southern Europe between friends or acquaintances, but less common in professional settings. In general, men and women will kiss the opposite sex, and women will kiss women. Men kissing men varies depending on the country and even on the family, in some countries (or areas like Southern Italy) men will kiss men; in others only men of the same family would consider kissing. In Portugal and Spain, usually, women kiss both men and women.

Because we are constantly licking each other.

Because they spend more quality time together, breathing.