Combination of the "hypnosis" and "erotic". See also hypnofetishism and my definition of hypnosex. Pertaining to hypnosis that causes sexual arousal that may or may not lead to orgasm. Written, aural or visual stimuli that lead to eroticism through hypnotic means (through hypnosis).
That website was certainly hypnoerotic. John has hypnoerotic interests. Those hypnoerotic sites sure are *hot*!