Everyone here is saying communication, which I whole heartedly agree with the most, and it kinda goes with my point. The second most important thing is boundaries. Do you not like your partner watching porn, going to strip clubs, or out past 8? Tell your partner about it and see how they feel. Come to a middle ground in what is or isn't appropriate in your relationship. Also if you're not physically comfortable with something in your relationship, again bring it up and tell them that maybe you don't like being cuddled all the time, or you're not comfortable being woken up with sex (it sounds rapey and should be assumed not okay, but many relationships are okay with this and encourage it, while others don't), and with all of it always try to tell them why you want to set the boundaries rather than that they need to be set so that they understand your point of view.