I am interested in the reason behind your parent’s decision. As for more contemporary examples, I had heard one time, but I cannot vouch for it’s certainty, that the late Warren Carroll (founder of Christendom College) and his wife were in a Josephite marriage, that they decided upon after learning that they could not have any (more?) children. I would suspect most couple’s who do so today, do it under similiar circumstances, but also when both (not just one) are at an advanced stage in their spiritual lives and under direct guidance from spiritual directors. In my opinion, those should be the criteria ( in addition to both being called Tonite, not meaning to implies it is always a part of being at an advanced spiritual stage).
And of course some couple’s due to purely medical reasons.