This leads us to the third and last problem, the “libido-problem.” In the human species voluptuous pleasure is almost completely divorced from the process of “fusion-love,” the coalescence of spermatozoon and ovum, and has for the most part become a phenomenon of “distance-love.” It appears extremely doubtful if there is anything specific about the voluptuous sensation--whether there is, in fact, a special “sexual sense.” Magnus Hirschfeld assumes the existence of peculiar “sexual cells,” of receptive areas for sexual stimuli, furnished with a sensory substance endowed with a peculiar specific sensibility. He regards love and the sexual impulse as “a molecular movement or force of a quite specific quality, streaming through the nervous system,” and accompanied by a quite peculiar sensation, or pleasure-tone, arising from a condition of excitement of the sexual cells. But, as we have already pointed out, the voluptuous sensation is merely a special case of general cutaneous sensibility; it is very closely allied with the cutaneous sensation of tickling; properly speaking, it is no more than an =excessively powerful tickling=.[14] It has also intimate relations with the sensation of pain.[15] The structure and position of the nerve-terminal apparatus of the genital organs, by means of which voluptuous pleasure is rendered possible, exhibit great similarity with the touch corpuscles and sensory end-organs of other parts of the skin. In the sexual orgasm the general cutaneous sensation increases to so high a degree of intensity, becomes so powerful, that for an instant =consciousness= is actually lost. The association of a momentary loss of consciousness with the acme of sensation indicates the summit of sexual pleasure--it is an abandonment, a dissolution, of individual personality. Voluptuous pleasure plays its part in the human species entirely in the sphere of distance-love. Bölsche has very beautifully described its significance in this relation: