My mate Edd sent me to Sperm for Tickets - a new website that offers to trade festival tickets for the healthy swimmers of young men.
Apparently fertility clinics in Ireland are currently in crisis - donations have plummeted over recent years - and so they've developed a very new approach to soliciting semen, targeting younger men from all over Europe to expand their potential universe.
In terms of understanding your audience and what motivates them - it's inspired. The incentive is spot on and the courier service removes one of the key barriers to donation.
There's something very strange about the idea but it's a remarkable solution to a challenging problem.
UPDATE: Edd points out that this might be a hoax.