In a judgement delivered today, the Court of Appeal dismissed his appeal.
The legal test for whether an extended supervision order can be made is that the offender is likely to commit sexual offences against people aged under 16 after release from prison, said the ruling.
"The essence of Mr Wilson's argument was that while he might pose a danger of sexual offending against adult women (although this was not conceded), there was not sufficient evidence that there was a real risk of his offending against persons under 16 years of age."
Wilson argued his three convictions for sexual offending did not reveal any tendency for offending against young people.
The Court of Appeal rejected these arguments.
"We are satisfied that the High Court Judge was correct to conclude that the appellant was likely to commit relevant offences upon ceasing to be an eligible offender, and that the extended supervision order was therefore correctly made," said the ruling.