Comparison of arousal and preference assessment outcomes for sex offenders with intellectual disabilities

Reyes et al. (2017) worked with five adults who had intellectual disabilities and a history of sexual offending.

The team compared two ways to measure sexual interest. One way used a plethysmograph, a device that monitors physical arousal. The other way used a simple picture choice test.

In the picture test, staff showed pairs of still images. The adult pointed to the one they liked more. Staff repeated the pairs until clear choices emerged.

Four out of five adults picked the same pictures that the plethysmograph said aroused them.

The picture test gave similar results without any wires or medical gear.

Gaily et al. (1998) used the same paired-choice method to see if adults with profound ID preferred work tasks that varied or stayed the same. They also found clear, individual choices. The match shows the method works for very different topics.

Buhrow et al. (2003) used still images to learn color and face preferences in students with ID. Their positive results line up with Reyes, adding confidence that picture tests are valid.

Taylor (2002) reviewed aggression assessments in offenders with ID and warned that many tools lack evidence. Reyes answers part of that gap by giving a quick, evidence-based option for sexual interest.

If you assess sexual behavior risk in adults with ID, you can now start with a picture choice test instead of jumping straight to intrusive devices. The test takes minutes, needs no special equipment, and respects client dignity. When results look clear, you may skip the plethysmograph altogether. Try it next time you write a behavior support plan that includes arousal monitoring.