Answer:Voyeurism
Explanation:Defining voyeurism
Voyeurism refers to an interest or a desire to watch people undress or having sexual activities , without those people knowing that someone is watching them.
A person who has an interest in this is referred to as a voyeur or most commonly referred to as peeping Tom.
The major factor of voyeurism is that those who are being watched are never aware of this usually because they are in their private space where no one thinks someone else might be watching them.