Mainstream pornography sites are 'changing what is normal', warns child abuse expert Michael Sheath Michael Sheath has been counselling people with what he describes as "deviant sexual interests" for a long time. "I have been working with men who abuse children for 33 years. For the first 15 years I worked with child molesters and I still do that, but now I also work with downloaders of child abuse imagery and online groomers."