A man who brutally bashed and raped two sleeping women in Western Australia, then claimed at his trial that they had propositioned him, has been jailed for 12-and-a-half years.

Clinton Samson, 26, first attacked a drunk 17-year-old girl while she was sleeping in a backyard following a gathering at a house in the Pilbara region in July 2016, the WA District Court heard on Friday.

The girl tried to push Samson off, then called out for help, but he put his hand over her mouth and punched her in the face.

She grabbed a bottle and hit him over the head, then managed to run away, the court heard.

Samson was later charged and granted bail.

In March 2017, Samson attacked a 22-year-old woman, who had also fallen asleep on a bed after drinking alcohol.

Samson put his hands around the woman's throat and choked her, then punched her twice in the face, the court heard.

He was arrested later that night and has remained in custody ever since.

During his trial, Samson claimed the women had propositioned him and asked for sex.

"In your words, you had sex with them in a good way," Judge Linda Petrusa said.

"You strenuously denied using any force against them at any time and claimed each woman had removed her own clothing."

Judge Petrusa said Samson had taken advantage of the women when they were at their most vulnerable and unable to protect themselves.

She said Samson, who was previously sentenced to four years in jail for sexually abusing a 15-month-old girl, was at high risk of reoffending and his prospects of rehabilitation were poor.

"It is clear you have no remorse for your conduct and do not see it for the predatory and violent behaviour that it is."

Judge Petrusa also commented that excessive use of alcohol was common and perhaps even more so in some indigenous communities.

"A strong message must be sent to you and to others that you cannot prey on alcohol-affected women," she said.

"Women are entitled to feel safe in our community wherever it might be, even if they've been drinking."

Samson, who was found guilty of two counts of sexual penetration without consent, must serve at least 10-and-a-half years behind bars before he can be eligible for parole.