I just went to take a look. Man, they've made searching a sub so hard, but in old.reddit.com i was able to find it.
Huh actually mixed results but more against it than I expected. https://old.reddit.com/r/AskReddit/comments/71ghg4/would_you_circumsize_your_newborn_son_why_or_why/
And so far I haven't found anyone taking issue with the implicit assumption that only your son's penis can be circumsized.
(post is archived)