In the pretty noir-ish "The Last Seduction" (1994), Linda Forientino's character is first very dismissive of the male lead when he's trying to pick her up, but when he says he's 'hung like a horse', suddenly she's interested, and puts her hands down his pants right then and there to check if it's true. Fiorentino has been open in interviews about her size queen tendencies, so I guess she fitted the role. 
Later in the movie she also tricks a black PI by playing on the whole 'is it true about black guys' business, although in this scene it's more about mindgames than actual interest.
Edit:
Found the first scene on YT:
https://www.youtube.com/watch?v=X6UrlgpATKU
Later in the movie she also tricks a black PI by playing on the whole 'is it true about black guys' business, although in this scene it's more about mindgames than actual interest.
Edit:
Found the first scene on YT:
https://www.youtube.com/watch?v=X6UrlgpATKU