Women who take the pill choose partners who share a similar genetic profile causing them to lose interest in sex and become more likely to be the victim of violent assault and murder.

It is just one of the unconventional theories of Dr Angela Lanfranchi, an American pro-life campaigner who also pushes the debunked link between abortion and breast cancer.

Dr Lanfranchi is set to speak at next month's "World Congress of Families" event in Melbourne where she will share the stage with federal Social Services Minister Kevin Andrews, and a number of Victorian Liberals, including state Attorney-General Robert Clark and anti-abortion campaigner and Victorian upper house MP Bernie Finn.

Women's health advocates on Friday said pro-life campaigners like Dr Lanfranchi were entitled to their views but called on members of government not to endorse flawed medical theories through their presence at the families congress.