Yahoo! said it all. For them who don't set limitations and selfishly think only of themselves.
"Public displays of affection are not necessarily synonymous with vulgar or inappropriate. They may even help to further strengthen a relationship. PDAs can also be regarded as a mutual gesture for showing conformity of love for each other. The main thing here is to take into account that you are not making those gestures at the expense of others. If your actions make the people around you uncomfortable, it is best not to indulge in such actions on the basic principles of civility. And if you really just cannot help showing your love for your partner then you should indeed ‘get a room’."