I am autistic. Sex seems to be the proverbial bugabuga that it’s always been. Leave the kids alone. Or they will find another place and it might not be a place adults approve of. Sex in cars is a lot of work. I would bet the ranch that the two boys are as confused as the parents of the boy with the bedroom. Sex is like that. If I were the parent, I’d be out there beating the bushes to find someone who could counsel both boys as to questions dealing with sex. I would attempt to find a gay male with lots of experience communicating sexuality issues and I would want someone who could speak to how gay men live and create community. It’s not all just sex. Do the boys know anyone who is gay. Where are the parents of the other kid. Do both boys see themselves as gay. Are mom and dad on the same page. Obviously, not. At their young age, nothing about life is written in stone. In a few years, the boys will be independent. I would ask them where else are they having sex. If either of the boys are engaging in sex anonymously with other people, then you have a problem. I would ask if the boys are able to articulate what a relationship means. I would hit the whole relationship thing very hard. I would invite the son’s friend to dinner or other family fun stuff and reinforce positive interaction. Everyone would handle it differently. If you push them away, then what. Seriously. Then, what. I do not hear a plan B. Teenagers don’t usually have one either. The key word here is relationship.