A SOUTH Australian father and daughter have revealed they are a couple, and have had a child together.
John and Jenny Deaves reunited 30 years after Mr Deaves separated from Jenny's mother.

Jenny was 31 and just two weeks after meeting, father and daughter had sex.

"John and I are in this relationship as consenting adults," Mrs Deaves told the Nine Network's 60 Minutes tonight.

"We are just asking for a little bit of respect and understanding."

Their nine-month-old daughter Celeste, shown on TV, appears fit and healthy.

Mrs Deaves said soon after reuniting with her father she began to see him as a man first and her father second.

"I was looking at him, sort of going, oh, he's not too bad," she said.

"Like you might look at a man across the bar at a nightclub."

Mrs Deaves brought two children, Samantha and Alex, into the relationship after splitting from her former partner.

Mr Deaves admitted that he "initially" thought having sex with his daughter was wrong.

"Emotions take over, as people no doubt realise, there are times during your life where emotions do rule the heart, it rules the head," he said.

"I knew it was illegal, of course I knew it was illegal but you know, so what."

Mrs Deaves said the physical relationship with her father was like "a sexual relationship with any other man".

For Mr Deaves the sexual relationship was "absolutely fantastic".

A South Australian police media spokesman said  "the couple is being monitored".