Edit: wow, I was not aware that the NSFW tag was such a big deal.
Just to clarify: NSFW doesn't mean I cannot refrain from masturbating at what I see, it just means I don't want to see this without first clicking on a blurry image. Everyone has their own sensitivity and it's sad to see not everyone respect that.
I don't want to debate on that all day and I'm not moderating this community (plus, this post comes from one of the moderators so I'm sure they know how to deal with it) so do whatever you want with it.
Please put an NSFW tag on this. I was on the train and when I saw this I had to start furiously masturbating. Everyone else gave me strange looks and were saying things like “what the fuck” and “call the police”. I dropped my phone and everyone around me saw this image. Now there is a whole train of men masturbating together at this one image. This is all your fault, you could have prevented this if you had just tagged this post NSFW.
I'm not sure we have the same definition of NSFW... I just don't want to see this kind of stuff if I haven't chosen to. The same applies for gore or shocking images, not just sexually explicit content.