"Generous" sperm donors are impregnating whole networks of lesbian couples whose children socialise together, says a reproductive technology expert in South Australia.

Dr Andrew Dutney told the Adelaide Advertiser that in one case around 30 lesbians were impregnated by the same man. Some of the mothers have picnics together where the children mix, not realizing they are related.

Perceived homophobia in the medical system and stringent South Australian regulations around fertility assistance are thought to be leading lesbian couples to seek help with making families outside the 'official' system, creating these issues, experts claim.

This story continues in the Adelaide Advertiser, linked below.