Definition: Voyeur or voyeurism is a practize where a person gets pleasure when watching women or girls having sex, naked, wearing underwear or dress in a fashion that may attract to the amateur "voyeur".
The word comes from the French "voir" (watch) combined with the suffix -eur. A literal translation could be "watcher" or "observer" with bad connotations.
Voyeurists practices may vary, but their main feature is that the amateur voyeur doesn't intercat directly with the women or girls watched, he is almost always not conversing with them.
The voyeur can observe the situation from a certain distance, watching through a keyhole, from a mobile, from a crack, or using binoculars, a mirror or the newest fashion, taking pictures from his mobile.
Stimulation sometimes turns into masturbation. The key feature behind the voyeur, and what makes him different from mixoscopy (to get excited watching other people fucking or jerking off) is that the observed don't get aware of the presence of the amateur observer.
Part of the emotion of the voyeur comes from the chance of being discovered. This way, not consented voyeurism is considered a violation of intimacy.
Sometimes, the material recorded by voyeurs is recorded to end uploaded as busted videos for mobile or as cult fetishist objects.