The documentary "Donor Unknown" about the adult children of a common sperm donor finding each other and their anonymous father will be airing in the US this week as part of PBS's Independent Lens film program. You can find more info and when it will be airing at www.pbs.org/independentlens/donor-unknown
I was able to catch this last spring when it was showing online and found it be very interesting. If you watch it I'd love to hear what you thought. I plan on watching it again and this time I will be sure to share my thoughts as well.