I usually think I'm an easy-going, accepting person, but these are the Non-Negotiables.

 (Meant in the romantic, "sorry, I won't date you if you do this" sense; not the investment banking, business sense)

• No Smoking.  I get that I don't exactly treat my body as a temple, but smoking is something I simply don't understand. It's disgusting and there are far more negatives than positives. With so much evidence to the contrary, why would one continue?! I get the nicotine addiction, but there are other less-destructive ways to get the edge off.  And aside from this debate...smoke actually makes me gag and feel like vomiting. So...Future Man In My Life (FMIML) will not be a smoker.  Ever.
• Support Gay Marriage. Ok, maybe not support, but FMIML cannot be against it. He doesn't have to want it, and I'll even accept indifference. The main point is: he can't outspokenly protest gay marriage. There are few things in this world I will fight for and speak up about, but this is one of them. I believe the right to marriage is one that belongs to humanity as a whole, not to heterosexuality, and I find no solid, legitimate evidence that the LGBT community shouldn't be allowed this. Of course I have other reasons, but that's enough for a Non-Negotiable List.  No H8 or no love from me.
• Interest in travel. Because I am going everywhere I can whenever I can, and I'd like him to come with me sometimes, too.
• Accept my non-religious life. I've always maintained that someone who does have strong religious convictions probably won't want me in the first place so this is a moot point, but I'll list it because it is important. I haven't figured out my beliefs, and I suspect that I never really will. I'm open for discussion, for debate, for the thought and exploration--but I do not stand for someone who punishes me for a difference in belief and/or pushes their faith on me.
• Interest in sports (or will at least fake it on my behalf).  I wouldn't classify myself as athletic and I definitely struggle holding up a conversation that includes sports trivia and current standings, but I love me some football, I like me some baseball, I adore me some Olympics and I play me some tennis.  He doesn't have to talk to me about it, he doesn't have to keep up in it, but I'd appreciate at least accompanying me to some games and not being rude about it. I will make the effort for his interests, so I'd appreciate it back. (And yes, I do know men who have zero interest in sports.  This bullet point is necessary.)

The rest, I suppose, is open for discussion.  What are your non-negotiables?