CREATE TABLE table_16175217_1 (children_per_donor VARCHAR, allowed_recipients VARCHAR)

What are the children per donor in the country where the allowed recipients are married or in cohabitation?
SELECT children_per_donor FROM table_16175217_1 WHERE allowed_recipients = "Married or in cohabitation"
SELECT "children_per_donor" FROM "table_16175217_1" WHERE "Married or in cohabitation" = "allowed_recipients"