For instance, do you want kids and he doesn't? Does one partner have to live in the countryside while the other needs city life?
A friend of mine, Dee, was in bed with her last boyfriend, and she asked, "Can we try something different tonight?" He said, "I've been doing this a long time. I know what I'm doing." How self-absorbed can a man get? She was stunned, and responded only in her head: "Well, you don't know my body yet and I'm telling you that I need more variety!" Subsequently, Dee gave him packing orders. She could NOT compromise to that degree and maintain her sanity at the same time.