voyeurism

noun

sexual interest in or practice of spying on people engaged in intimate behaviors

Wiktionary

Pronunciation: /ˈvɔɪəˌrɪz(ə)m/ / /vɔɪˈɜːrɪz(ə)m/ / /vwɑˈjɜːrɪz(ə)m/

noun

Etymology: Etymology tree English voyeur Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íďďō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Indo-European *-mos Proto-Indo-European *-mós Ancient Greek -μός (-mós) Ancient Greek -ισμός (-ismós)der. English -ism English voyeurism From voyeur + -ism.

The derivation of sexual satisfaction by watching unsuspecting people secretly, especially when those being watched are undressed or undressing, toileting, or engaging in sexual activity.
The derivation of satisfaction by obsessively watching or following sensational or sordid subjects.