If ever there were two actors who could make sexism and loutishness look adorable, they're Owen Wilson and Vince Vaughn. The “Starsky and Hutch” co-stars perform precisely such a feat in “Wedding Crashers,” a raunchy comedy of errors that manages to be hilarious and insufferable at the same time.

The pre-P.C. plot is like something dreamed up after late-night viewings of “Bachelor Party” and “Soul Man.” Best pals since childhood, John Beckwith (Wilson) and Jeremy Klein (Vaughn) work together (as divorce mediators) and play together (as skirt-chasing scoundrels). Putting aside traditional dating methods, John and Jeremy have hit on a novel method for fulfilling their getting-laid quotas: Every summer, they scour the Washington, D.C., area looking for weddings, where unattached, attractive women are many and inhibitions are few. It doesn't matter if the revelers are Jewish, Hindu, Irish-Catholic or straight-up American Protestant — John and Jeremy are there, laughing it up with drunken uncles, delivering toasts, making balloon animals for the kids and dazzling women with the same obnoxious lies about Purple Hearts and pro baseball careers.

And how is it that nobody — not even, say, a vigilant wedding planner — ever sees through the ruse and kicks out John and Jeremy on their adorable rear ends? Because it's Owen Wilson and Vince Vaughn, and they're very, very good at being adorable.

It all comes to a predictable head when John — the less fanatical of the two — suffers a crisis of conscience, falls soberly and seriously in love with the foxy daughter of a U.S. senator (Rachel McAdams of “The Notebook” and Christopher Walken, respectively) and smooth-talks an invitation to a family retreat in coastal Maryland, where Jeremy is forced to endure one painful and sexually humiliating predicament after another.

Ultimately, false identities are exposed, followed by the obligatory “you were different” speech and much romantic hand-wringing, which — somewhat miraculously — never drags too mightily in the hands of director David Dobkin (“Clay Pigeons”).

For that, Dobkin should thank Vaughn, whose squawking wit and clever ad-libs have brightened many a comedy, from “Old School” to “Be Cool.” This cinematic groomsman is the life of the party.