A Brazillian farmer whose only hobby is having sex has sired 50 children with four women — who included two sisters and their mother.

 Luiz Costa de Oliveira, 90, told media: "The thing that God made best in the world was woman."

He said: "I could have other children out there that I don't know about because I've always liked making love.

"I don't know all their names. I hardly make love anymore these days, even though I'm in good health.

"But I still remember how wonderful it is to be in bed with a woman."

The virile pensioner had 17 children with first wife Francisca and after she died, he found love again and had another 17 children with Maria Francisca da Silva, 64.

When Maria got her sister Ozelita to help with raising the children, Luiz struck up a relationship with her too.

The 58-year-old then gave him another 15 children.

Even the sister's mother was not safe. Francisca Maria, 89, succumbed to Luiz's charms — and had one child with him.

Some of the children died during a poverty-stricken childhood but the others gave Luiz, from Rio Grande do Norte, Brazil, more than 100 grandkids and 30 great-grandchildren.

Second wife Maria Francisca added: "Luiz's only hobby was making love.

"He never mistreated us, he always looked after his children well and we never wanted for anything."