Orientation perception

• Orientation intuition
• Sense of orientation
• Special intuition, in modern lingo
• Ability to detect a certain orientation
• Orientation detector

Wiktionary Word definitions in Wiktionary
n. The supposed ability to detect whether or not a person is gay by observing that person.

Wikipedia Word definitions in Wikipedia
Gaydar (a portmanteau of gay and radar ) is a colloquialism referring to the humorous claim of an intuitive ability of a person to assess others' sexual orientations as gay , bisexual or heterosexual . Gaydar relies almost exclusively on non-verbal clues ...