The term "sucking faces" is often used to describe an intense make-out session between two people. However, there are several other words and phrases that can be used to describe this type of activity. Some popular synonyms include locking lips, necking, smooching, canoodling, making out, and tongue wrestling. Each of these words and phrases has a slightly different connotation, so it's important to choose the right one depending on the context of the situation. Whichever term you choose, be sure to use it appropriately and respectfully when referring to someone else's intimate activities.