Years ago I dated a guy who was 6'6" tall. I am 5'4". Like others have said, in bed, it was not an issue. But I do remember that while walking around and talking, I did get tired of having to look up at him; it bothered my neck to look up that high, particularly when standing right next to him. I remember when we were out, I would often seek out some stairs or a small curb or ledge to stand on to kiss him. His height had nothing to do with why we broke up, though. Maybe I would have just gotten used to it if we stayed together, but after that, I realized that having a shorter guy had some benefits.