How important is sex in a relationship?

Now I know that different people require a different level of affection, cuddling, kissing, and sex, so the answer to this will vary. But lets say from the beginning of your relationship, sex, cuddling and just touching has been a consistent practice from both you and your partner. Years later, kids later, arguments, laughs and cries later.. would you expect the level of intimacy to be at the same level or at least near that level?

Another version of the question: If everything with your mate is perfect(well almost perfect being that no one is perfect) but the sexual intensity, the fire, the passion is not there, would you, could you continue to build a relationship with him/her? And…and.. is that shallow to even ponder the thought? Hmmmmmmm…. Let me know what ya thinking! Women and Men