Celebrity couples: They are good-looking, loved up and know how to work it on the red carpet, but there’s an increasing number of A-listers getting X-rated when it comes to Public Displays of Affection.

For Justin Bieber & girlfriend Selena Gomez, a day at the beach turned into something of a love-in, but they are not alone. Many celebs have become experts in all types of public affection, so here’s a selection of my favorites:

First up and with plenty of cringe factor is The Steamy Smooch: Will Smith & wife Jada Pinkett-Smith were caught on a Jumbotron going for a Hollywood kiss at a basketball game, while J-Lo and Casper Smart have been snapped smooching anywhere and everywhere....