frottage

a technique used in drawing and painting that involves the use of textures to create a pattern or texture

Frottage is an art technique where artists create textures and patterns by rubbing or pressing a material, such as paper, against a textured surface. The result is a detailed copy of the surface's texture, which is then used in artwork. For instance, an artist might place paper over a rough surface and rub a pencil or crayon over it to capture the texture, which can then be used in drawings or other artistic works. This technique can add interesting textures and effects to a piece, giving it a unique and physical quality.

masturbation by rubbing against another person (as in a crowd)