The story says her brother restrained the naked would-be rapist until police arrived. Wouldn’t you like to be a fly on the wall during those tense few minutes! Was there shouting and screaming? Thwacking on the head? Inconspicuous evaluation of genital size? Also, you gotta wonder… was the sister sleeping half-naked in a g-string or what? Inquiring minds want to know.

From the Salt Lake Tribune:

Intruder allegedly tries to rape girl; brother rescues her
Shotgun, ax and women’s clothing are found in suspect’s car
The Salt Lake Tribune
Article Last Updated: 05/11/2007 01:21:02 AM MDT

A naked Provo man allegedly tried to rape a 17-year-old girl in her home early Wednesday but was tackled by the girl’s older brother, police said.
  Just after midnight, a man entered the girl’s home through an unlocked back door, left his shoes by the door and crept up two flights of stairs to the sleeping girl’s bedroom, according to a police affidavit. The man took off his clothes and got onto her bed, the affidavit states. When the man touched her face, she awoke, started screaming and kicked him.
  The girl’s 22-year-old brother came into the room and wrestled the naked man off his sister. He restrained the would-be rapist until police arrived.
  Police arrested Forrest Barth, 21, who allegedly told them he intended to take the girl’s virginity. Police searched his car and found a shotgun and ammunition, an ax, boxes of rubber gloves, electrical tape, a woman’s teddy, a marijuana pipe and a gas mask. Barth had allegedly been stalking the girl and was arrested Monday, but was released after posting $4,255 bail, police said.
  Following the alleged rape attempt on Wednesday, Barth was booked into the Utah County jail without bail.