Tim Burton's Corpse Bride. No, I am not kidding. It is a fantastic film. First, it treats marriage as an irrevocable social and spiritual tie which nothing save death can sever. Second, it seems to accept that the bond is more important than personal feelings of concord. (Victoria's dreadful parents ask her if she assumes that they like each other. They don't. And yet they agree on everything: interesting!) Third, it suggests that there is something more important than getting married one day. Finally, it can be watched by anyone without moral harm. Cartoon eyeballs continually fall onto the floor and into soup, etc., but so what?
Really, if you haven't seen it, see Corpse Bride.
Another good film on the subject of Searching Singledom, though with salty humour and "adult" situations, is Private Benjamin, starring Goldie Hawn.