Cuba’s communist government is seeking to rally support for a new family code that would open the door to gay marriage and boost women’s rights, but experts and a recent survey suggest an upcoming referendum vote may not provide a rubber stamp. Tepid support for the reforms, which clash with the island’s entrenched “machista” culture, threatens to hand state-backed supporters a defeat amid a government push to encourage open and frank debate. The proposed 100-page code, under scrutiny in town-hall style meetings throughout Cuba, groups together a swath of new regulations on family conduct. It overhauls several 1975 laws from the era of former Cuban President Fidel Castro.