That sounds terrible. I wouldn't want mud up in my snatch... and you couldn't kiss or nibble or anything, because you'd be eating dirt. What a bad idea.
Rather than mud, just put down a plastic sheet, smear your entire bodies with vaseline, and writhe around on the sheet and have sex. You each are the other's greased pig. Then take a long shower together, washing each other's body, and throw away the sheet.
