At a high-school party, four friends find that losing their collective virginity isn't as easy as they had thought. But they still believe that they need to do so before college. To motivate themselves, they enter a pact to all "score" by their senior prom.

With high school a distant memory, Jim and Michelle are getting married — and in a hurry, since Jim's grandmother is sick and wants to see him walk down the aisle — prompting Stifler to throw the ultimate bachelor party. And Jim's dad is reliable as ever, doling out advice no one wants to hear.

Ten years after the first American Pie movie, three new hapless virgins discover the Bible hidden in the school library at East Great Falls High. Unfortunately for them, the book is ruined, and with incomplete advice, the Bible leads them on a hilarious journey to lose their virginity.