Where can I get the list of forbidden topics before posting a story?

SO I have a story almost made. It's pretty long, and comes in two parts (I'm finishing the second part currently). The problem is: it's pretty dark, and on other story resources I saw some rules that prevent me from sharing it there. Here, I only found a requirement that all characters are of legal age.
But still, to be sure I want to know if there are some list of topics that are forbidden to be included in the story.

The story is sci-fi, and is basically a kind of tentacle alien theme, the kind that's popular in Japan. I shared the first part somewhere already, and people seemed to like it. The themes that caused problems on other resources though are:
1) suicide (although no one actually die from it in the story);
2) lack of consent (because the victim is flat out kidnapped);
3) torture (because what happens to her is not pleasant);
4) death. The story will develop so that one of the bad guys will die, and it is hinted that one of the other characters could probably be killed too.

The story still features happy ending. Will it be acceptable to post such a story here?
Thank you.