Dressed in skin-tight, zip-front Spandex catsuits, initially with Hunter wellies, but once those are covered in mud soon becoming barefoot, they slide, crawl, and roll through the semi-liquid muck, almost swiming in it at times, and having an absolutely awesome time together.

Their tight suits, worn with nothing underneath, get steadily more and more covered in mud until they are both completely drenched in it.

At the end of the scene they slither through the mud into the river and wash the worst of the mud off, before getting rather mucky climbing up the mudbank again afterwards.

Note, although they do both get some mud on their heads and faces there isn't any full mud shampooing, nor faceplants--this scene is entirely about their super-sexy skin-tight spandex suits getting utterly drenched in mud, and then the two of them slithering and sliding and rolling about in the glorious semi-liquid mud.