Change the question to "How does anyone appropriately nurture his or herself?". I would suggest that first you figure out what you as an individual need in order to be whole and healthy. Next you figure out to what extent you can provide these things for yourself directly and to what extent these needs can only be filled within a social framework. Then you do whatever is necessary to meet your own needs directly and you do whatever is necessary to meet your social needs by building social ties that will meet these needs. If you determine that you are an individual who needs regular sex within the social framework of a committed relationship in order to be whole and healthy then you must do whatever is necessary in order to meet this need including dissolving your current relationship and forming a new one if necessary. Anything else is an act of self-destruction which can't possibly do any good for anyone.
REPEAT AFTER ME (and Corri): I will not stay in a sexless marriage. I understand that sex within marriage is not important to you but it is important to ME. If you want to remain married to ME, you must make sex within marriage a priority. This is a serious problem which will deeply damage our marriage the longer we delay in solving it. We must come to an agreement about including sex in our marriage on a regular basis by ______________ or I shall take (some first step towards breaking our marital or emotional ties.). Love, Hairdog.
You have been on this BB long enough to know that this is what you have to do. Good luck my friend!
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver