I've been thinking about this recently (somewhat due to my college courses, and somewhat due to my own friendships/relationships), and I thought I'd pose the question to DLP (why you all, I don't know). This applies to relationships/friendships as a whole, so when I say relationships, I do not just mean romantically. Should you have many common interests with your significant other? With your friends? How many is 'many' to you? Are you happy sharing one or two interests with someone close to you, or do you like to have all/most of your interests in common? Is there one interest that is a dealbreaker to you? The same applies to beliefs, of course. What can someone believe differently than you on and still maintain a relationship with you? How do you balance differing ideas of spending time and hanging out with one another? E.g. wanting to spend time at home watching something, playing something, or talking, and wanting to do 'activities' outside of the house? Whether you were the homebody or the one wanting to do more activities, did it put a strain on the relationship? What type of activities are good compromises between those two extremes? People who have been married for a while or had a particularly long-lasting close friendship, what key interests and beliefs do you share? I know there are no easy answers, and it depends on the person, but I'm really just curious what other people think, whether it is a glib response or a heartfelt description of the end of a friendship. I will include my own response in a later post; I don't want it in the OP.