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Taking the words "grass roots" literally, charity Fuck For Forest are a group of environmentalists who shoot porn to raise funds.

Michal Marczak’s doc follows Norwegian ex-jockey Danny and his friends as they head to Peru, getting a 1/10 response by handing out flyers to girls.

The X-rated stuff starts out blurry but eventually you get an eyefull: boobs, weathered penises and Germany’s top 10 opera singer having a Jodrell. Marczak probes for cracks but finds the group’s deadly serious, none more so than founder Tommy whose commitment could churn stomachs.