In a statement read in court during the punishment phase of his trial, Hill said he deeply regretted the attacks and hopes his victims "find it in their heart to forgive me."
"It would not happen if I did not have mental issues," Hill added.
He blamed his aggressive behavior on an incident when he was 13, when a "white guy in his 40s" knocked on his door and said, "We're going to have some fun." He said he screamed and ran away after the man touched his "personal areas."
He also said he prayed to both God and the devil for instruction and decided to attack men because "it would be less hard on them."
The judge barred prosecutors from introducing photographs pulled from Hill's home computer. Baytown police said the images demonstrated Hill's fascination with porn, especially "sexual bondage with white males," the Houston Chronicle reported in its online editions.
Hill is black and all the victims are white.
The victim in the case testified Monday that he thought he was going to die in the attack that began as he searched for something in his car.
He said he was blindfolded with duct tape, his hands were tied behind his back with zip ties and he was forced in the back seat of an SUV. There the assailant forced him to perform oral sex and hit him on the back of the head with a gun eight or nine times.
The young man, who was 17 at the time of the attack, is not being identified because he is a victim of sexual assault.
Hill said in his statement he struck two victims after the assault because he was "upset at them for doing what I told them to do."
The case not only spread fear in the oil-refining town of 70,000 people about 30 miles east of Houston but also piqued the interest of those who study the criminal mind because the attacker preyed on men, something of a rarity in the world of crime.
The U.S. Justice Department says one in 33 men in the United States has been a victim of a rape or attempted rape, compared with one in six women. Experts say men are far less likely to report a rape because they fear being perceived as weak.
