I saw this under the title "Swedish Lessons in Love" which suggests that it's going to be Swedish erotica. But what it actually is is a German film, yet another knock-off of the popular, endless "schulmadchen-report" series--and not a very good one.
There are four stories here about "immoral" German youth. In the first story a dumb couple have sex right in the art classroom (after a nude painting session goes horribly awry), and are caught in the act by their art teacher, who then tries to sexually blackmail the girl, but eventually gets his comeuppance. In the second story a teenage girl's mother discovers her secret diary, which reveals that the girl has lost her virginity to the handsome, slightly older musician living across the hall (shocking!). The third story is the dumb tale of a young Eastern European lothario who serially seduces naive virgins, but gets his comeuppance when three of these lustful virgins "gang-rape" HIM (oh, the horror! the horror!). For some reason this "gang-bang" scene is intercut with photographs of the character as a young boy(?). The last story involves a male teenager who is (sucessfully) seduced by his gorgeous female French teacher, which turn him into a stud able to effortlessly seduce his female peers (I think I detect a double-standard here when it comes to teachers sexually preying on students).
These stories are all pretty lame--and regrettably non-Swedish--but the film does feature the lovely Ulrike Butz (or maybe Claudia Fielder--I get them mixed up). Butz/Fielder was in any number of "schulmadchen-report" films and was probably the most attractive of these actresses next to Christina Lindberg. There's no Christine Lindberg or other Swedish actresses here (nor too many real "lessons in love"), but I suppose this isn't entirely worthless as softcore/"nudie" flicks go.