Keith Partridge is the lead singer in a rock band, which sounds cool. Except that most of the other members are little kids. And, oh, yes, his mom. Steamed by the restrictions this places on his attempts to be a rock star, he goes into his mom's bedroom to confront her. Surprised but aroused by what he sees, he takes matters into his own hands. She is initially upset but eventually decides it wouldn't be a bad idea to get to know her son in the Biblical sense.
A single mum, worried by her fifteen-year-old son's increasingly hermit-like lifestyle, decides to re-create a camping trip she'd taken years earlier with her father. It doesn't go entirely to plan.
Take two horny parents and fold in their two horny teen children. Add one horny aunt. Now blend with a half-dozen horny teen jocks. Spice with a potent ED drug and you have the recipe for a fun afternoon.