Abstract
Male rats were trained to secure a sexually receptive female by pressing a lever. Two problems were investigated: (1) "relationship between length of time allowed for recovery from sexual exhaustion and amount of sexual behavior necessary to produce a second exhaustion," and (2) relationship between instrumental responses leading to sexual opportunities and subsequent sexual performance. Recovery varied directly with time following previous sexual exhaustion. Bar-pressing rate was not sensitive indicator of motivational strength after differing periods of recovery, but does differentiate reliably between sexual performances of different animals. Bar-pressing rate is higher when ejaculation is imminent, but varies inversely with number of copulations preceding ejaculation.

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