Voyeurism

Voyeurism is a practice in which the individual derives sexual pleasure from observing other people. Such people may be engaged in sexual acts, or be nude or in underwear, or dressed in whatever other way the "voyeur" finds appealing. The word derives from French verb voir (to see) with the -eur suffix that translates as -or in English. A literal translation would then be “seeor” or "observer", with pejorative connotations.