How can you show someone pornographic pictures as a "test?" That seems immoral in and of itself!
Immoral, yes; impractical as well. The RCMP ended up shelving the "Fruit Machine" because it turned to be practically useless.
Anybody know how psychiatrists test people for sexual preference these days?
I would imagine you don't even have to use naughty pix on the fruit machine to gauge a pupil response...just normally clothed gender specific ones would do!