My wife and I were married, and it was determined that the reason we were having aproblem conceiving was due to Endometriosis. This was not discovered until some years after we were married and a baby was not forthcoming. I do not consider our situation as out of the norm.
Men and women get married. Some wives are likely on the pill for a time to hold off having a baby right away. Then they "decide" it is time and find that they might have saved lots of maney wasted on the pill, becasue suddenly they find things are not going as they planned.
The "source" is common sense from someone who knows.
Ah, now we know why LittleNipper must at all costs avoid the thread which must not be named.
So, LittleNipper, since you and your wife cannot conceive children:
(1) You should never have sex again.
(2) You should not be married.
(3) There is no point to your marriage.
And of course, you are prohibited from divorcing her and remarrying, so basically no sex ever again for you.
No wonder you're so jealous of gay people.
My sympathy.