Are you saying that committed, loving relationships should remain sexless if the people don't want children?
No
But let's say you are extremely poor and cannot afford to have/raise a child. Then perhaps avoiding penetrative sex is in your best interest. Yes?
I would want to avoid penetration at all cost in this situation because I don't want my wife to have to make the decision to abort or not.
Then after the tough period ends and we got our ducks in a row, life can return to normal and take our chances with regular contraceptives. And if a pregnancy does occur there, well then we have some discussion about what to do.
What is there's an 'oops' and that would destroy the relationship?
By "oops" do you mean an accidental pregnancy? I'll assume so.
If an "oops" destroys the relationship. Then it wasn't that strong to begin with.
If by "oops" you mean infidelity. The same applies. If they don't love you enough to go without sex, the relationship is false to begin with.
A strong relationship has a bond that goes beyond sex. That is the foundation to build upon, a strong friendship, trust, love, honor, respect, compromise, and for me faith.
So going back to you and how high a value you place on sex. I want to ask a hypothetical question if I may. Considering how high a value you say sex has.
If your wife/partner became disabled/mutilated or could no longer engage in sex for whatever reason. Is that a deal breaker for you? God forbid that ever happen. But would you stay with them for the rest of your life, forced to be without sex? Would you stay with them and just have sex outside the marriage? Or would you leave them behind, and find a new partner? (No judgment from me regardless of your answer)
If it was me in that situation. I would stay with her and live without sexual contact from anyone else, just Mary Palm and her 5 little friends if ya catch my drift. Because if I have decided to marry someone then I its because i love them, not for the sex, the sex is just a cherry on top, a bonus prize. The love shared is the grand prize.