Frottage is when you rub your body against someone else. It can legal and pleasant at home with your partner, or it can be dangerous and illegal, as in the Japanese trains, where they have special plain clothes police to catch offenders.
cottage frottage
Ernst, Max in 1925
2013
Max Ernst
Toilet, china and poo
Frottage
The frottage technique is used in artistic works where the artist will take a pencil or other coloring tool to make a rubbing over textured surface. This product can be the final work of art of can be the framework for future improvements of the piece.
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Not in that specific terminology. In jurisdictions in which I have worked it falls under the more general category of "Indecent Assault."
The word frottage is derived from the French language, and it simply means rubbing. There are sexual techniques that involve rubbing the penis against various body parts, such as a thigh, as an alternative to bodily orifices such as the vagina, anus, or mouth. It is a very safe form of sex. Some people are quite fond of it.
this is an activity called frottage or frot and is quite pleasurable for those guys who enjoy it. Especially good if the guys enjoy kissing while they do it.
For guys, at least, the possibilities are unlimited, especially if the partners don't insist on cumming at the same time. In addition to mutual masturbation and frottage (rubbing bodies together), any position that gets a penis into a mouth or butt will do.