Is it a one off occasion where maybe someone used conditioner/hair mask (or those harder to wash off soap)? Quick solution can go to those mama shop and get the anti slip mat for bathroom More on reddit.com

I went with matte (not shiny) porcelain 1” penny hex tile. I also used it for my shower floor. You can also get a nonslip rug to put right outside the shower/tub area. I know that’s not the visual style you are looking for, but I purposely picked these tiles because they were less likely to slip on - and they also looked nice with the (shiny) marble-look porcelain wall tile I had chosen. I also installed a proper handrail in my shower and also a shorter one on the wall where I exit my shower. I chose them when I picked out my plumbing supplies and hardware and had them installed when the the tile went in. These are not the same as towel bars; they are designed to take your weight. I purposely picked ones that matched all my bathroom hardware and they are attractive enough to hang a towel on when needed. They don’t look like handicapped equipment. More on reddit.com

I've had a couple of friends now lay their own cork tiles - one specifically in the bathroom and kitchen of their new build (about 5 years ago now. The others were in their living area with underfloor heating. Both very happy with the result. Warm, cost effective, easy to lay yourself. I've helped with both installs and it was a good time, fairly quick and a nice material to work with. Getting the ones that are already adhesive backed is recommended. More on reddit.com

Double-sided tape under the rugs will stop them from moving around. I think they make tape like that especially for rugs. More on reddit.com