You know those brilliant, deep, dark thoughts that can have you achieving an awesome release in no time at all type fantasies.
Because some of them are very deep and dark, once finished climaxing you feel bad at having even thought them. Is that a sign that it's better left fantasy? No, I'm not talking anything so dark it's illegal type stuff - just whatever fantasy it is for you that makes you feel deeply shameful after the release.
Is it a sign or is it just you aren't comfortable enough with it to make it a reality?
For some it could simply be being called "slut" while in the throws of passion, for others it could be fantasizing about a full-blown gang-bang - either way, when it leaves you feeling shame after, what is that?