Another distinguished anthropologist, Paolo Mantegazza, has devoted special attention to the physiology and psychology of what he calls "I pervertimenti dell'amore."[51] Starting with the vulgar error that all sexual inversion implies the unmentionable act of coition (for which, by the way, he is severely rebuked by Krafft-Ebing, Psy. Sex., p. 92), he explains anomalous passions by supposing that the nerves of pleasurable sensation, which ought to be carried to the genital organs, are in some cases carried to the rectum.[52] This malformation makes its subject desire _coitum per anum_. That an intimate connection exists between the nerves of the reproductive organs and the nerves of the rectum is known to anatomists and is felt by everybody. Probably some _cinædi_ are excited voluptuously in the mode suggested. Seneca, in his Epistles, records such cases; and it is difficult in any other way to account for the transports felt by male prostitutes of the Weibling type. Finally, writers upon female prostitution mention women who are incapable of deriving pleasure from any sexual act except _aversa venus_. Mantegazza's observation deserves to be remembered, and ought to be tested by investigation. But, it is obvious, he pushes the corollary he draws from it, as to the prevalence of sexual inversion, too far. He distinguishes three classes of sodomy: (1) Perpheric or anatomical, caused by an unusual distribution of the nerves passing from the spine to the reproductive organs and the rectum; (2) psychical, which he describes as "specific to intelligent men, cultivated, and frequently neurotic," but which he does not attempt to elucidate, though he calls it "not a vice, but a passion"; (3) luxurious or lustful, when the _aversa venus_ is deliberately chosen on account of what Mantegazza terms "la desolante larghezza" of the female.[53] Mantegazza winds up, like Burton, by observing that "sodomy, studied with the pitying and indulgent eye of the physician and the physiologist, is consequently a disease which claims to be cured, and can in many cases be cured."[54] After perusing what physicians, historians, and anthropologists have to say about sexual inversion, there is good reason for us to feel uneasy as to the present condition of our laws. And yet it might be argued that anomalous desires are not always maladies, not always congenital, not always psychical passions. In some cases they must surely be vices deliberately adopted out of lustfulness, wanton curiosity, and seeking after sensual refinements. The difficult question still remains then--how to repress vice, without acting unjustly toward the naturally abnormal, the unfortunate, and the irresponsible. I pass now to the polemical writings of a man who maintains that homosexual passions, even in their vicious aspects, ought not to be punished except in the same degree and under the same conditions as the normal passions of the majority. VII. LITERATURE--POLEMICAL.