In horses, sheep, and cattle, ejaculation occurs within a few seconds, but in boars , it can last for five to thirty  minutes. Initial contractions occur at an average interval of 0. From Wikipedia, the free encyclopedia. Spermatogenesis spermatogonium spermatocyte spermatid sperm Oogenesis oogonium oocyte ootid ovum Germ cell gonocyte gamete. Nottingham University Press.
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The semen produced during early puberty is also typically clear. After this peak, the magnitude of semen the penis emits diminishes as the contractions begin to lessen in intensity. Some people do this to avoid making a mess by keeping all the semen inside. The US study involving "29, US men aged 46 to 81 years"  suggest that "high ejaculation frequency was related to decreased risk of total prostate cancer".