Yet another adolescent string of gross-out bits about an adolescent trying to end his virginity. After a high-school hottie exits the bedroom of his 14-year-old little brother, 18-year-old Ian (Josh Zuckerman) is invited to smell his sib’s moist finger. He does. “Are you sure you got the right hole?” he asks. Ian’s only sex partner is his own hand. After some morning sex, he tosses his cum-squishy shorts on his bedroom floor and his new step-mom slips for bone-shattering shtick. And the anal jokes are endless. To find real sex, Ian and his pals Felicia (Amanda Crew) and Lance (Clark Duke) drive an orange-red ’69 GTO with the plates “NOFATCHX” from Chicago to Nashville for a hook-up with Ms. Tasty, Ian’s Internet pal. Regional humor enlists a trailer park gal who likes to do “rolling brown-outs” with her handcuffed sex partners, and Ezekiel (Seth Green), a passive-aggressive Amish mechanic. Swipes at Tennessee dentistry ensue. Director Sean Anders and writers Sean Anders and John Morris are abject slaves to teen mall-plex taste. The vulgarity is safely mediocre, for all that’s worth. With James Marsden, Alice Greczyn, Katrina Bowden, Charles McDermott and Fall Out Boy. 108m. (Bill Stamets)