"Viaj kisoj estas pli dolĉaj ol vino."
Translation:Your kisses are sweeter than wine.
The general word for "to flirt" - as in "to let someone know you're interested in them and to try to woo them" is amindumi. The word the course authors have chosen (flirti) has the primary meaning of "to flit" - as in "to bop around from one flower to another like a butterfly -- or to wave like a flag. When used in the context of romantic relationships, flirti is much closer to "running around" than flirting.