This is an edited version of the documentary "Sleeping With My Sister", which follows two half-siblings couples that fell in love after reuniting as adults. It's one thing to hear about oppression, but another thing to see it. The documentary is amazing, and surprisingly sympathetic to them - I think it's actually making an argument in their favor. The couples reinforce the ignorance over birth defects, unfortunately, and at one point throw those in familial relationships under the bus, but that's not unusual. The full documentary is definitely worth watching.