Also you may like to read Theology of the Body or one of the condensed explanations of it, as many married people find this enriches their understanding of the role of sexuality and fertility in their loving relationship. You also have, even if only in the back of your mind, the knowledge that you now will never have more children. That may not affect you when you are busy raising three. Later in life in might.
Interesting point.
There are emotional issues here too that women tend to ignore. Losing your fertility for life is not just a simple procedure, and your husband has lost his as well, essentially, in the marriage. It’s not only a “one time” sin issue, but something that will affect your feelings toward each other, and that aspect needs to be explored by reading, marriage encounter, or other ways of keeping the communication flowing in the marriage.