Eager or immoderate excitement or action; the state of turgescence of any organ; erethism.
2.
Especially: The peak of the physical pleasurable sexual excitement caused by stimulation of the sexual organs, as in intercourse; in the male, it is usually accompanied by ejaculation.
3.
Hence: An eruption of intense, uncontrolled excitement; used of groups and individuals.
... the substantive puberty is no less perplexing. One writer uses it to denote the time at which procreative capacity begins, and believes he is right in assuming that in the male this time is indicated by the occurrence of the first involuntary sexual orgasm.[2] I may point out in passing that there is a confusion here between procreative capacity and competence for sexual intercourse, for as a rule the first seminal emissions contain no spermatozoa. But, apart from such confusions, ... — The Sexual Life of the Child • Albert Moll
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