The funny thing is, I think the idea that cuckoldry would be a non-issue if people were thinking clearly is pretty close to conventional ideas about adoption-- that people shouldn't use biological descent to make distinctions among the children they're raising. See also the fairly successful efforts to reduce the stigma of bastardy.

Well, one of the main emotional objections to cuckoldry is feeling betrayed and lied to, which isn't the case in adoption. I don't think being lied to is only an issue due to unclear thought, even without the status issue.