It is my understanding that being subjected to the scanner is optional and not a requirement. They make it seem as if scanning is required, but the last time I was at the airport you had the option of being manually searched as you said you were subjected to after the scanning.
Next time refuse to go through the scanner and if they ask why just say you prefer to be manually searched.
I'll never go through another one of those scanners again. I'll take a my nuts being felt up.