Greece, Germany, USA and Iceland.
Leontine Olsbjörk from Gothenburg has done a dna test and via a dna site found half-siblings around the world.
She is up to 25 pieces, but thinks there are more.
Through the sperm bank Cryos, based in Aarhus, Denmark, she has tried to get the exact number.
- They were very clear that it was information that I have no right to know, says Leontine Olsbjörk.
See the report: Sperm theft
When Uppdrag veransking asks Martin Lassen, sales manager at Cryos, it appears that the information is difficult to obtain.
Each country that buys sperm is asked to report to the bank how many pregnancies the donation results in.
Martin Lassen says Cryos aims for each donor to give birth to children in between 25 and 50 families around the world.
At the same time, he states that the demand is high and that the donors are not enough.
Each country has different rules regarding the number of donor siblings within the country's borders.
In Sweden, each donor may give birth to children in a maximum of six families in addition to their own.
Sperm donated in Swedish public hospitals are not sold on to other countries.
The risk – meeting the half-siblings at the pub
Leontine has an Instagram account for those she calls DCP - donor conceived people - and notices that many are worried about the sibling issue in particular.
How big the risk is of meeting a half-sibling in the pub is a question that is being discussed.
- How do you handle this?
It is very difficult.
I never worried about it when I thought I only had twelve siblings.
But now there are many more.