Lust is called unnatural if man is aroused to it, not by its real object, but by his imagination of this object, and so in a way contrary to the purpose of the desire, since he himself creates its object.
(Metaphysics of Ethics, quoted from R. Scruton, Sexual Desire: A Philosophical Investigation, p. 319)
So the perversion is not that it is so much involved in carnal pleasure, but the will. Any masturbatory act involves substituting the real thing with the image, and involves overpowering that image in order to satisfy one's own sexual desire to achieve orgasm. In reality, the crime has already occurred. And if thoughts are things, real things, then an act of rape, against the will of that person who is the object of one's fantasizing has already occurred, as Jesus taught. In truth, what is missing is the will of the other. Only an act of love would lead to lovemaking, and involves the free will of the other... loving oneself.
And finally, any act that does not involve the heart and mind... and which does not seek others, real people, but only tries to gratify the flesh as a substitute for one's loneliness, is only wasting their own time in idleness.
Any "yogic" masturbation, even if it involves yoga, lacks compassion. It lacks the awareness of others. It is purely hinayana, or devoted to the spiritual development only of oneself. Granted that the seminal fluid can be transsubstantiated from raw physical substance to spiritual essence (Shakti), it is still lacking of compassion of a Mahayanic spirituality.
Any great Guru or human being is concerned with agape, as well as eros, of the other. That is what makes a true Guru or human being, who exists as part of a community and of the world, and is not an island to himself. Such an island, anyway, is an illusion... the truth being our interconnectedness, of which love is the currency.

...oneLove

