Beeld has reported that former Springbok captain Joost van der Westhuizen cheated on his wife, Amor Vittone, with former Springbok athlete Charmaine Weavers, formerly Gale.
Weavers represented South Africa in the 1992 Olympic Games.
In the past Van der Westhuizen reportedly denied that he had a relationship with Weavers.
Weavers, 46, is reported as saying she is glad Van der Westhuizen has now openly admitted he was the man in the sex video.
"It's just such a pity that his confession was so selective, instead of rather confessing to everything," she told Beeld.
Weavers had previously told Huisgenoot/You - anonymously - that she had sex with Van Der Weshuizen while Vittone was pregnant.
When Beeld approached Van der Westhuizen about Weavers's claim, he said: "There were many sins and I did many wrong things. My plea for forgiveness in my book reaches wider than just the video; it includes my general past.
"From now on I just want to walk the straight and narrow (path) and do things right.", he said to Beeld.
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