It may not have been about the sex for Stephen Hawking. Think adrenochrome. He may have been convinced that adrenochrome-filled blood of the young had restorative or curative properties. That makes him more evil than those using children for sex because children have to die for maximum adrenochrome harvest. He was diagnosed with ALS when he was 21 and died when he was 76. The average life expectancy of those with ALS is 3-5 years after diagnosis. It appears that TPTB moved Heaven and Earth to keep that man alive.