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Studies in animals have identified the medial preoptic area (MPOA) and the paraventricular nucleus (PVN) of the hypothalamus and hippocampus as important integration centers for sexual function and penile erection: electrostimulation of this area induces erection, and lesions at this site limit copulation. 21, 22 Marson et al. injected pseudo A study was conducted to determine if sexual motivation in male chimpanzees, defined by the two components, sexual arousal and arousability, could be quantified by measuring penile erection during laboratory pair-tests of sexual behavior. Sexual arousal, the momentary level of sexual excitation, was animals with erections Sexing animals to tell whether they are male or female can take a great deal of training. In the case of the hyena, even the visible genitals are not as helpful as they could be. The clitoris and the penis are analogous organs in mammals, and in some species the clitoris can be sufficiently large to be termed a pseudo-penis. The diversity of animals that have been caught taking a bit of alone time goes far, far beyond dogs humping legs. Here s a sample. 1. Primates.