Breasts, bits, sex and swearing: welcome back teensploitation.

The leads in this third slice of pie may be graduates, but their characteristics remain the same. Finch (Eddie Kaye Thomas) is still a square, Stifler (Seann William Scott) a jock and Jim (Jason Biggs) a self-confessed perv, about to marry his nympho girlfriend, Michelle (Alyson Hannigan).

As franchise fans will expect, getting hitched isn't hitch-free.

Within 15 minutes, Jim's lost his trousers twice - once when proposing, then meeting the in-laws. Dog molesting, excrement-eating and pubic hair problems follow, as the gross-out genre gets a kick in the noughties.

So, then, not exactly Shakespeare - although the Bard wasn't averse to a spot of smut. In fact, from As You Like It to The Canterbury Tales, popular entertainment has long had recourse to groin-centric humour.

Simply, it's fun. Crude and lewd, yes. In bad taste, no question. But The Wedding will make you laugh. American Pie re-started a cycle of teen sex comedies which, to use the vernacular, blew. Even its sequel sucked - reducing the characters to cardboard cutouts, souring the sweet kids of the original.

AP3 is just as crass, but includes just enough sweetness with the sour. Jim is a likeable everykid, but it's Eugene Levy who injects heart, as the caring father given to sharing too much information (Your mother can still make me squeal like a pig).

Amid the effing and grinding, there's a moral message to the movie. Making a marriage work requires compromise and sacrifice, says Jim's dad, while his schmucky son tells his bride-to-be, I think you and I are a perfectly natural, normal thing.

Brief and underplayed, these scenes are sentimental without being cloying: promoting acceptance amid the buffoonery and bawdiness. Some things still sit uneasy - the stripper sequence feels degrading - but the target audience will lap it up. No sniggering at the back.