Who doesn't remember their first love: the initial flush of excitement; the negotiations of power in the relationship; and in some cases, the painful parting. That's the premise of "Down to You", an innocuous romantic comedy that has more emphasis on the former and less on the latter. What it does have that elevates it beyond other teen flicks are two charismatic stars -- Freddie Prinze Jr. and Julia Stiles -- who radiate warmth and a palpable chemistry.

Unfortunately, the story devised by Kris…