Term: peeping tom
Example: good ol' grandpa henry always has plenty of stories of how he used to be a peeping tom when he was in his 20's and seen plenty of hot [naked] [boobs]
Definition: [stealthy] by [nature], peeping toms use the latest [state-of-the-art] technology such as [digital] [binoculars] to spy on woman in any manner of [undress]