There's really only one - don't post anything that would violate this forum guideline:- 10. Please be aware that some posters may find messages containing explicit sexual content, including links to graphics or imbedded images that are pornographic in nature, very foul language, etc. to be objectionable and posts may be deleted from a forum for that reason.
However, it will be fine to imply almost anything. For example, back in the days when the Sci-Fi channel provided screen captures of all its programming as it was being shown, they had a popular Web page on their site where viewers/fans could add captions to those captures as each came up (in fact that page is what inspired me to add this board to the forum - just don't ask me why it's taken THIS long for that inspiration to hit. [lghy]) and one of the cousins on this forum (who shall remain nameless) once provided the following caption to this capture:
(http://www.dsboards.com/sampcap.jpg)
Willie: "Oh, yeah, Mrs.Johnson, just a little lower!"
It's not at all explicit and it's completely up for interpretation. True, most of our minds will slip right into the gutter. ;D But for all we really know, MrsJ might simply be giving Willie a really great and completely innocent foot massage. [wink2] And anything more is completely in our own demented and/or depraved minds. And so long as in the estimation of the forum's admins/mods none of the captions cross that line, they'll be completely acceptable.