One of South Australia's foremost experts in reproductive technology - Andrew Dutney - said that in one reported case, about 30 lesbians were impregnated by sperm from one man, the Advertiser reported.
The mothers then organised picnics with all the children, raising the fear they might socialise with their half-siblings without realising they were related.
In another case, a man's sperm was used to produce 29 children, most of whom were living in Adelaide.
They did not know who their half-siblings are, raising concerns that in a "big country town" like Adelaide, they could accidentally commit incest.
Ah yes, the gift that keeps on giving. If it were in America, there would be accompanying banjo music right about now...