Is this inappropriate or no ?

So Ik there are ppl in their early 20s who still live with parents till they can get on their own feet. My question is. When dating, I understand you’re under someone else’s roof. Sex is highly inappropriate of course but what about cuddling ? Like for example if we are watching a movie together is laying too close to one another too inappropriate ? I was told it was. For a younger couple I understand but I mean that old? Come on now. BUT HEY More encouragement to work even harder for our own place ASAP LOL. opinions?