My partner and I have not had sex in almost 1 year we have a 3 month old daughter now and I think that last time that we did have sex was when we concieved her. I do think that sex plays a important part in a relationship, but if you not getting any and your not happy I do not believe that cheating is the answer. I think that answer to sole that situation in communication, you need to be able to talk to your partner about what your needs are and what there needs are, and if you cant come to a comprimisation then it's best to part ways, saying that, that is only when both parties are willing to do that. Also you may also have the option of having a open relationship so that way you still have the intimacy of a loving relationship and both parties are not missing out on the sex factor.