He carried a rape kit, taped victims' eyes shut and videoed it for "later enjoyment."
A former X Factor contestant has been sentenced to life in prison.
Serial rapist Phillip Blackwell, 56, from Launceston in the UK, admitted to 31 sex offences carried out over a 22-year period.
Passing sentence on Monday, Judge Peter Cook described him as "monstrous", one of "the most dangerous individuals" he'd ever encountered in court, and having "no regard whatsoever for [women] as human beings", the BBC reported.
He told another: "I'm not going to hurt you, we're just going to make love if that's OK?"
A third he told to "close her eyes and count to 100" after he had finished raping her.
One woman, who managed to persuade him to not rape her and remove his balaclava, he told "should be a social worker for talking him out of it."
He also threatened victims against reporting the attacks to the police, telling one: "I know where you live. You have a beautiful body and I can do this over and over again because I know where you live."
Passing sentence Judge Cook told him: "You got away with leading a double life for as long as that because you are clever, because you are calculated, because you are forensically aware, because you are devious and because you are manipulative."
"It is clear that you equipped yourself with a rape kit – a balaclava… tape for binding hands and covering eyes, and a camcorder to record for your later enjoyment."
"It is clear that you have an appreciation for female anatomy but that seems to be the only regard you have for women," he continued, per the Standard.
“You have no regard whatsoever for them as human beings or the impact for what you do to them. You must treat them with a level of contempt that is too shocking to even contemplate."
It will be nine years before Blackwell is even considered for parole, and he will remain on the sex offenders register for life.
According to the publication, Blackwell has played in a number of bands, with names such as AWOL, Missing People and Suspect.