There are many writing workshops on the Internet. To the knowledge of the moderator, if the group is tightly moderated and membership is limited to those who provide critiques, there should not be a problem. Editors recognize the utility of critique groups and that many authors belong to them. Besides, you'll almost certainly change the story after they see it, so what you submit to an editor is different than the group saw. I have this great idea for a time travel novel.
Some people believe that time travel is against the laws of physics.
Time travel is no problem. The moderator feels that erotic SF is acceptable. It might be a sensitive issue for some people. Be polite to those who may have strong feelings on this and put a paragraph or so at the top of your Ms advising them it contains erotic material. All rights reserved.