Liberal politician Giulia Jones will this weekend speak at a conference organised by an ultra conservative group who are lobbying against same-sex marriage.
Mrs Jones is listed as a guest speaker at the Australian Family Association National Conference on Sunday.
Fairfax Media has not seen a copy of her speech but the topic is listed as 'Igniting the aspirations for successful families in adolescence'.
A spokeswoman for Mrs Jones said her speech would focus on relationship building for teenagers.
"Before Giulia was elected she used to provide advice to high school students on the importance of building strong and long lasting relationships," she said.
"She occasionally gets invited to speak on this issue and I am told that her speech at the AFA event will be along these lines."
However the association, which says its aim is to protect the sanctity of families, has also strongly advocated against same-sex marriage and the Safe Schools program.
The association website allows hundreds of politicians to be emailed at once with just a few clicks and was used to spam Liberal MPs with messages in support of Tony Abbott ahead of his "near death" leadership spill (Mr Abbott was toppled in a second leadership spill later that year).
On its Facebook page the association said marriage regulated relationships, sexuality, human reproduction, lineage, kinship, family structure but crucially "morality"."This is why the challenge of same-sex unions is so urgent and important," the association wrote.
"Redefining marriage is never simply about marriage. It leads to the redefinition of reproduction and parenthood, produces a legal revolution with vast consequences, replaces an old social order with something completely new, and forces the adoption of a new morality."
Mrs Jones, a former Tony Abbott staffer who is opposed to same-sex marriage, last year was the keynote speaker for another conservative group, the National Civic Council, which is vehemently opposed to same-sex marriage, abortion, liberal divorce laws, and the "idea that all cultures are equal".
At the time Mrs Jones said she did not have to agree with the views of organisers to speak at events.
National Civic Council vice-president Patrick Byrne will deliver the keynote address at the conference's National Marriage Day Dinner on Monday.