I've found several forms...Merde is what I "learned" in school. I found it in that Alternative Dictionary link too...looked it up to make sure I was still remembering correctly.

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“Sex is one of the most personal things we do as people. To have someone who says she loves you limit how you express yourself in the bedroom is like a small death. It kills the soul.” --Anita Blake to Jason Schuyler in "Blood Noir" by Laurell K. Hamilton