I have a question about PDA?

Ok so recently there were pictures posted of Selena Gomez and Justin Bieber in Hawaii and fondling each other. I have a boyfriend and as far as I go with pda is kissing and we are both the same age as selena. I was wondering how far the average person goes with pda, and are there any laws, which someone could ask you to stop (like movie theater or mall), against pda?