Login_to_view said:
I think everyone is overthinking it.
Regarding breast sucking (although it can apply on many other things) - it played for laughs (post #1457005), depicted in a motherly way (post #2838189, post #375060), or is otherwise featured in content without an apparent sexual tension? Then it's Q (or even S depending on the context and depiction).
Is it being done in order to stimulate the partner, or is otherwise featured in content with sexual tension? Then it's E.
post #7963905 is E, there is no doubt about it. It's easy to surmise the context of the picture too (although I would be curious to know what alternate interpretations one could come up with).
I haven't read the entire thread, but I would suggest making a sexual act tag if sex isn't an option.
General visibility is also a factor. Even hardcore sex acts can be Q if they're not clearly shown. Regarding post #7843571, the act doesn't appear as explicit as others, and it's not really focused on in a lot of detail. I'm not saying that's necessarily enough to lower the rating, but it should definitely not be rated higher than post #7963905. At least one of those posts needs to be rerated.