Some more reasons why "muh closed door" is a retarded line.
1. Quick thought experiment, you can pick one of two communities to live in. Community A is 100% faggots. You and your wife might be straight but literally every other person your children interacts with will be a faggot. All of the other children in this community (let's assume somehow there is a normal amount of children, it's a hypothetical) are being raised by faggots and taught that it's normal to have 2 dads. Nothing illegal ever happens and your kids don't ever have to actually see the ass sex, so it's all muh closed doors, but it's still 100% fags. Community B is 100% heteros and bans faggotry.
Which one do you want to raise your kids in? Do you think they will be more likely to become fags themselves if they grew up in one community vs the other? Any honest and sane person will pick Community B. The retort is likely to be "but nowhere is 100% gay in real life!!!1" Yes and thank goodness for that. The point is that the more faggotry you have around, the more risk you're putting your kids at, and the ideal is zero risk. Learn how the Amish eliminate sodomy with this one weird trick, faggots hate them! Of course, the other retort is to pretend that faggotry is somehow normal and wouldn't represent a negative outcome for your child. If you believe that you're probably a moral relativist/general shitlib and hopeless.
2. Let's extend "muh closed doors" to some other types of behavior besides only sodomy. Propaganda has successfully convinced most people that it is fine and normal to commit sodomy "behind closed doors," but if we broaden this out for 2 seconds, it becomes immediately apparent that "it's behind closed doors" isn't a viable defense for degeneracy and no one actually thinks it is if they are being honest. Let us suppose there is a couple who likes to get pregnant, abort the kid late-term, have the husband rape the dead fetus, then cook and consume the remains. They find this dead cummy baby ritual sexually satisfying and do it over and over again.
It's technically legal, no one is getting hurt by any direct violence, it's all behind muh closed doors, but they aren't ashamed of it either and consider it totally fine and normal to do. You will not want to associate with these people, you will try to avoid them and you won't want to let your kids be around them. Same deal for degenerates who fap to loli art and are out and proud about it. And anyone who claims they would ackchyually be okay being around such people are either liars or wild degenerates themselves. It's not that the heckin' closed doors somehow made something okay, it's just that the line for what is acceptable and what is considered degenerate has been arbitrarily (yet successfully, from a social standpoint) moved forward to put sodomy on the other side of it.