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On average, seven. Depending on the intensity of the orgasm and the amount of semen to be eliminated, a man can have five to ten jets. This occurs because during orgasm the pelvic muscles contract repeatedly through nervous stimuli, releasing the sperm that is left at the exit of the urethra. In most cases, it is from the second contraction onwards that the first jet occurs and, in this ejaculatory race, whoever leaves first has the advantage, since the first two squirts are more forceful and represent 40% of the total volume of semen expelled. In an orgasm, a man can ejaculate from 2 to 5 ml, the equivalent of a teaspoon.
SOURCE: Fernando Almeida, urologist at the Federal University of São Paulo