We see the process very well illustrated by the occasional action of the emotion of anger. In animals the connection between love and anger is so close that even normally, as Groos points out, in some birds the sight of an enemy may call out the gestures of courtship.[139] As Krafft-Ebing remarks, both love and anger "seek their object, try to possess themselves of it, and naturally exhaust themselves in a physical effect on it; both throw the psychomotor sphere into the most intense excitement, and by means of this excitement reach their normal expression."[140] Féré has well remarked that the impatience of desire may itself be regarded as a true state of anger, and Stanley Hall, in his admirable study of anger, notes that "erethism of the breasts or sexual parts" was among the physical manifestations of anger occurring in some of his cases, and in one case a seminal emission accompanied every violent outburst.[141] Thus it is that anger may be used to reinforce a weak sexual impulse, and cases have been recorded in which coitus could only be performed when the man had succeeded in working himself up into an artificial state of anger.[142] On the other hand, Féré has recorded a case in which the sexual excitement accompanying delayed orgasm was always transformed into anger, though without any true sadistic manifestations.[143] As a not unexpected complementary phenomenon to this connection of anger and sexual emotion in the male, it is sometimes found that the spectacle of masculine anger excites pleasurable emotion in women. The case has been recorded of a woman who delighted in arousing anger for the pleasure it gave her, and who advised another woman to follow her example and excite her husband's anger, as nothing was so enjoyable as to see a man in a fury of rage[144]; Lombroso mentions a woman who was mostly frigid, but experienced sexual feelings when she heard anyone swearing; and a medical friend tells me of a lady considerably past middle age who experienced sexual erethism after listening to a heated argument between her husband and a friend on religious topics. The case has also been recorded of a masochistic man who found sexual satisfaction in masturbating while a woman, by his instructions, addressed him in the lowest possible terms of abuse.[145] Such a feeling doubtless underlies that delight in teasing men which is so common among young women. Stanley Hall, referring to the almost morbid dread of witnessing manifestations of anger felt by many women, remarks: "In animals, females are often described as watching with complacency the conflict of rival males for their possession, and it seems probable that the intense horror of this state, which many females report, is associated more or less unconsciously with the sexual rage which has followed it."[146] The dread may well be felt at least as much as regards the emotional state in themselves as in the males.