A seven-year itch.

The Seven Year Itch tells of a middle-aged man, Tom Ewell, who develops sexual fantasies about a newly arrived upstairs female tenant while his wife is away on vacation. In the film, Marilyn Monroe plays this alluring and性感撩人的 female tenant. The curvaceous Monroe teasingly flaunts her seductive charm to Tom Ewell, the intellectual downstairs neighbor, pretending it's unintentional. This leaves Tom Ewell restless and uneasy, unable to suppress his vivid sexual fantasies about this enticing stranger, which keep flashing through his mind uncontrollably.

(Note: 性感撩人 can be translated as "seductively charming" or similar depending on context for more appropriate tone.)