I think it depends on what each of you want from the relationship. If she wants children and you don't, that's a biggie (or vice versa). Sometimes people get caught up in the newness of a relationship thinking they have met their soulmate but in reality that is not the case. They are just projecting qualities they want in a partner to the person they have met without realizing it. Sex may be great now but what if life circumstances change for one of you (menopause, women troubles, etc.) and the hormones are no longer in full swing? Will that change the relationship for you? It's hard to think realistically when you are embroiled in the height of a romance. If you have differences in what you expect from your partner (in everyday life) such as going out with friends, family, participating in hobbies. These should be considered in planning a future together. Don't underestimate the importance of little things like caring for one another when sick or if either of you are bringing children into the mix. There is much to consider.