Muslims, why is kissing in public haraam?

Question

http://www.chinadaily.com.cn/english/doc/2004-11/23/xin_051101231036341106584.jpg

Answer 1

I'm not Muslim but here is a Muslim response I've found.

"I think as (married) Muslims, we should keep the intimacy between husband and wife to a low in public, I don't believe it's modest. Kissing in public is a big I think passionate kissing, hugging is not allowed any ways and neither is any act that may arouse people around you.

Question: On embarking on a journey or coming back, a Muslim traveller embraces and kisses his wife in public. Is this permissible for him?

Answer: It is not haram to do that, if the rules of appropriate covering [of the clothes] and hijab are observed and as long as it does not entice lust [in other people]; it is preferable to refrain from this kind of behaviour.

http://www.najaf.org/english/book/5/inside/46.htm

So basically, keep your relationship to yourself I wouldn't feel comfortable letting my children see other couples do their thing (infact it's desired for the husband and wife to not behave in that way even in front of their children), so I don't have any plans of me exposing my relationship for the whole world to see. "

Answer 2

Because Muslims aren't supposed to make out in public or tell other people about their sex lives as that is only to be a private matter with a husband and wife. Even a man and woman who are married may not talk about the sex they did the night before.