If he or she makes fun of you...

Gossiping about the person you're dating is a pretty dumb idea, but many people do it anyway. Don't take it. Now, in his or her defense, this is the least offensive of things on this list, but it's still bad, and it's still something you should say something about. Don't let it go-- tell him or her you disapprove, and it needs to stop. Dealing with problems later will be much easier if you start standing up for yourself now.

Let this person know early on he can't mess with you. You're tough, and when it comes to your body, you're in control.

Conclusion

No means no.

There are people who will treat you right-- people who would never make you think of looking at this list. But you won't find a person who heals if you stay with someone who hurts.