What are the children per donor in the country where the allowed recipients are married or in cohabitation?
CREATE TABLE "table1_16175217_1" (
  "country" text,
  "donor_payment" text,
  "children_per_donor" text,
  "donor_anonymity" text,
  "allowed_recipients" text
);
SELECT "children_per_donor" FROM "table1_16175217_1" WHERE "allowed_recipients"='Married or in cohabitation';