Peccati di gioventu (1975)

Starts with a blonde getting her pussy eaten on a bed, but the real action kicks in when a stacked redhead in lingerie joins two guys. One dude is already finger-fucking her while she makes out with the other, then a third guy shows up and it turns into a full-on DP. She takes both cocks at once like a champ, moaning loud enough to hear over the Christmas tree lights in the background. Later, two more guys jump in for a group scene on a couch—she’s riding one, sucking another, and getting her tits played with by the rest. The beach part is solid too: same redhead, now topless, getting pounded missionary-style on a towel with her legs wrapped tight around the guy’s waist. Good mix of close-ups and wide shots so you don’t miss any of the action.