It is not necessary or advisable to put toilet paper down there when you shower to prevent leaking. Showering is a normal and hygienic activity, and it is normal for water to flow down the body and potentially onto the bathroom floor.
To prevent slipping accidents, most showers have a floor designed with non-slip surfaces. If your shower does not have one, consider using a non-slip mat or adhesive strips.
If you notice excessive leaking or water pooling outside the shower area, it might be due to a faulty shower curtain, door, or drain. In such cases, it's best to address the underlying issue rather than relying on makeshift solutions like using toilet paper.
Regularly inspect and maintain your shower area to ensure proper functionality, and if you encounter persistent issues, consider seeking the help of a plumber or maintenance professional.