Having Sex in public places - Is it acceptable?

Here we will discuss about the thing Sex in Public Places. I really don't have any idea about what you people feel about it? But my thought about this problem is, that kind of Sex is not acceptable. because when we have four walls to do any thing that we like, then what's the need for these kind of things. Seriously there is no any need for it and not needed too. Now a days we can the Sex in public places like Parks, Cinema Theaters, Malls, Shopping places and so on. But no one is worrying about it, because no one showing interest towards it. Many are taking it in a simpler manner and not caring about it. They don't bother about the thing to how much extent their actions is going to affect the others, but they will simply do the thing what they like. You people just share the thing whether the Sex in public places is acceptable or not?