Sex in public places. Is it acceptable?

The thing that we are going to discuss here is "Sex in Public places". It is happening many countries and in many places like Beach, Parks etc,. I am not going to put so much about this post, because from the title itself you people can get the subject of this post. I want you all to share your thoughts here. Just say whether it's acceptable or not reagrdless of Broadminded Thinking, Developed Countries, Under Developed Countries, Modernised World etc,. and also tell the reason.