The Power of Human Sexual Fantasy is a scientific thesis of human sexual fantasy to demonstrate a relationship between our sexual fantasies, or the lack of them, to our sexual orientation or sexual preferences. It clearly demonstrates human sexual fantasy as a "computer program" with a set of mathematically intensive algorithms using relationships and toolsets we have yet to discover or to develop. This book completely contradicts more than 20 major theories on the subject, and severely criticizes American psychiatry for its consistent failure to properly study the subject or to develop the medical science, technology and industry to re-program our sexual orientation and sexual identify to match our gender and the sex of our body. If offers a most significant breakthrough for us to understand sexual fantasies and its engineering applications to humankind.