Green’s Dictionary of Slang

French sexuality, which, in Anglo-Saxon eyes, is ‘spicy’ and ‘naughty’.

1918		Stars & Stripes 22 Feb. 4/1: ‘Oo-la-la! This is France!’ That is the impression which altogether too many men have had in mind upon their first arrival here [...] But they must not [...] think of her (as her enemies would have us think of her) as a ‘daughter of joy’.
1939		W. Winchell On Broadway 11 Dec. [synd. col.] Most of the Frenchies gave it too much of the ooh-la-la, but her confab with B. Crosby made her A Girl To Know.
2006		M. Bednarek Evaluation in media Discourse 183: The ‘ooh-la-la, those saucy French’ dimension to the story has also attracted British tabloid journalists.