My problem was that the question was closed because the answer might have been hentai/porn.1
Looking at the borderline NSFW image, it doesn't suggest that it's hentai on the service, and since the OP hasn't posted something which is blatantly hentai or from a porn site, I am giving them the benefit of the doubt. The User already said they did a Google reverse image, and while I would rather have seen a screenshot as proof, I'm going to take their word for it (look at me being so trusting).
While the image can be arguably SFW/NSFW, it doesn't violate Stack Exchanges Content Policy as I understand it. If it does then would this Food Wars Foodgasm violate it too? Or any image from an ecchi series? Or a screenshot from the Strawberry Panic anime of Hikari and Aname after they made love? My understanding is no, because they aren't Sexually Explicit Material, and personally I wouldn't be ashamed if someone saw me looking at the Strawberry Panic one even at work.
What if the answer wasn't a hentai manga, and someone just closed the question (in this case by moderator) saying that it's an "identify my porn" question in the comments, that could end up killing a question. It's one thing if it's a borderline NSFW image. However, what if a question is all text like this question, and such a comment was made, but the answer turned out to be not a hentai because the poster of the comment mistook it for something else or what they believed was in fact incorrect.
So if we close questions because the answer might be hentai/porn, then what happens when the answers are Visual Novels like Fate/Stay Night, Sono Hanabira, Kamidori Alchemy Meister, Kira Kira or Canvas 2. Some may see these as hentai because of the adult content, despite having non-H versions of them (Fate/Stay Night Realta Nua), all ages anime adaptations (Canvas 2) or have their stories expanded in non-H material (Sono Hanabira).
If we were to created the message that a woman who undresses herself but covers herself as much as she can is hentai, then where does that leave Neon Genesis Evangelion? In the Director's Cut version, you can see the Rei Clones' nipples. Same thing with Misato after she had sex with Kaji, and her position in that scene is much more NSFW than a whole lot of lifeless Rei Clones. While the Rei Clones, with some research will get one an answer, it may not be like that with Misato
So what should we do?
If we allow ID Requests for Hentai or H-Doujins then
- The question has to meet out current guidelines
- Any and all images must not violate the Stack Exchange Content Policy
- If they are borderline then they must be in a spoiler tag
>! and a textual heading must be placed to indicate as such
The wording of the question must be tasteful, avoiding porn language and using politically correct terms while also avoiding describing intercourse scenes
Answers should not contain links to where one can read/buy it if the answer is hentai, but they should clearly indicate if they are hentai or just NSFW, since not all Madoka and Nanoha Shoujo Ai/Yuri Doujins are hentai, but still can be lewd or have suggestive themes (they still retain the lovey-dopey yuriness of the couples)
If we do decide to now allow them when we close them, in a comment we don't leave something like "take your porno elsewhere" but something like
I have closing this question because the answer to this question can be found on Fakku (no need for a link) and it is clearly a hentai
This way, even if the OP didn't know it was hentai, they do now and other users can validate this claim when/if they want.
1: My mistake in reopening the question may have been misreading the times. Right now, when I look at the times for the answer and when the question was closed, the text still says "yesterday". However, the times have different dates