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@Alaisguineasis, I don't know what must have triggered out this question out of you, I must say, "it's really a rare question anyone could ask, I like it!", but I do have an answer to the question.
MISSIONARY WORK
Based on religious perspective, a married couple might choose not to have kids at all, so as to be focused completely as having kids around might cause distractions and difficulty in keeping their lifestyle as simple as possible for a couple who have chose to volunteer to go for missionary work.
Concerns such as food, clothing, shelter and money are the basic provisions needed by all but the rate at which it's needed by a couple with kid(s) will differ from that of a couple without kid(s).
Missioners who want to render sacred and undiluted service would keep a clear focus, as they will spend more time in service, so they pay less attention to basic provisions mentioned earlier, as it's not so with couples who have chose to have kid(s).
Best regards,
Samal.