Hello all
So my 40 th birthday is coming up and my wife will be more relaxed by then and have an broader mind by then to. Anyways I would love to answer her if the question comes up if I want anything special for my birthday. I would love to roll around nude with her in some mud. Three years ago we had half our back yard rototiller up. It rained for eight hours. That afternoon the sun beat down on the area and that night it turned about 90 degrees. I thought here goes nothing, I said why don't we take off our clothes and go play in the mud, the kids are asleep. She stood up smiled walked over to the window and said that smells good! I thought this can't be happening! She then said is there a place to clean up? I was like yup! She took out her gorgeous hair undid her robe a little exposing the front of her gorgeous nude body started making her way to the door with a huge smile got to the door and said I can't what if the neighbors see!!! So I beg you fellow mud lord vets to share any receip for mud in a inflatable pool! I would love to reproduce the mud madmudphil made! Thsnks

As I see it, you've got 2 options:
1) high quality, loamy, smooth potting soil
2) some kind of commercial clay

The clay is going to be smooth and slippery. Most people who've done clay never want to go back to the grittiness of anything else.

You could have a 3rd option if you want to use something like methylcellulose. It's not mud, but it would be awesome for a roll with the wife.