Why would any person send Demons to another person to possess their body with out their consent? To hurt that person of course. This invasion by the Demon sent to your body is to cause harm to you of course as are most cases.
A demon would not be able to possess you without your express permission and willingness to be possessed. Secondly, even if you DO want to be possessed by a demon, the process is extremely difficult. If done during a ritual, it is an exhausting experience that takes preparation, focus, and determination. If done "passively" as you're describing here, you'd FIRST have to give full consent to the demon to possess you. That would have to happen first. Once you've given consent, the process of possession by passive means can take weeks, months, or even years, depending on the situation. Also, its worth pointing out that somebody being "as sexual as this man is" does not make them a sexual psychic vampire.
A demon would not be able to possess you without your express permission and willingness to be possessed. Secondly, even if you DO want to be possessed by a demon, the process is extremely difficult. If done during a ritual, it is an exhausting experience that takes preparation, focus, and determination. If done "passively" as you're describing here, you'd FIRST have to give full consent to the demon to possess you. That would have to happen first. Once you've given consent, the process of possession by passive means can take weeks, months, or even years, depending on the situation. Also, its worth pointing out that somebody being "as sexual as this man is" does not make them a sexual psychic vampire.