What is the English term (noun or adjective) to denote someone (usually male) who likes watching adult materials, staring at sexy girls, or acting strangely around,but not necessarily committing any sexual crime (btw, sex crime or sexual crime?), usually not welcomed by people around. It should be a negative term.
com/browse/voyeurism voyeuristic (adjective)
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https://en.wiktionary.org/wiki/voyeur
voyeur (noun - the person)
"peeping Tom"
voyeurism (the act)
https://www.dictionary.com/browse/voyeurism