Something occurred to me about ponds/mud WAM

There's not a lot of WAM out there involving stagnant, muddy ponds that have algae and moss growing in them. I must say the idea of a model sliding into the mud as well as water that's equally as slimy and dirty would be quite attractive. Is this due to health reasons or is it just ? I can't imagine there being much more bacteria in stagnant water. But I believe the only shoot I've ever seen that was even close to this was an old one on Most WAM shot in a forest. But even then it wasn't exactly what I'm thinking of.