I think what confuses me is:
Were there not scenes in College-ish that do exactly what’s bolded here? I would have expected those scenes would be in violation of this guideline, but clearly it is not the case that “anything suggesting” a sexual encounter is forbidden. I would like to know where the line is because I don’t find it very intuitive. I’m not personally interested in writing or reading sex scenes (in fact I find much of what is on here quite off-putting), but, in theory, having more decisive parameters on what is and what isn’t allowed could make quality control easier. They’d have more specific rules they could provide to authors in violation of content guidelines, and then those authors wouldn’t be like, “Yeah, but this or that story has sex scenes and it was featured/on a shelf/has 5 million reads” because the rules would distinguish what is from what isn’t part of the verboten “anything suggesting” sex is taking place.