DeWitt and Maria (2010)

Dewitt Fulbeani is not a ladies man. He is positive that love is chemical, and he has devoted his life to creating a computer program to prove it. He has even identified his first subject, a girl living in his apartment building whose name he knows only by her mailbox - M. Vornellini. However, unbeknownst to Dewitt, their parents have both already beaten him to the punch.