I don't think it is within the same classification as rape really. I would akin it more to someone manipulating another person to the point they feel emotionally and mentally helpless - there's no physical assault - traditional rape is typically a physical show of dominance and humiliation. This is something that happens in real life, without the aid of psychic abilities. It's abuse, I'll grant you, but more along the lines of torture or terrorism. For instance, if you wanted to torment a woman whose kid had just passed, you could send her pictures in the mail of child autopsy photos (I don't approve of this!). It would achieve the same effect as what Xavier threatened to do to Crossbones by forcing him to relieve memories of a troubled childhood, it's similar to what the psychic did to Peter to jar him conscious (but to lesser degree as it's more like a bad dream Peter's having rather than a constant visualization of a terrible event).