For example, you want to watch a movie together, but neither of you have the same tastes in movies. What do you do?
Because both of you are self-giving, you both say that the other can pick, you're thus in a deadlock.
At some point, there's going to need a compromise, because you can only pick one movie and neither of you happen to like the same movie.
So best you can do is compromise by alternating, this time you watch your preferred movie, next time there's.
Or you compromise by not watching movies together, but seperately.