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| CITAZIONE humans, chimps, and bonobos -but not gorillas- show "accelerated evolution of genes involved in sperm and seminal fluid production" associated with "multiple insemination".
Margulis and Sagan: men's "souped-up genitals" backed by "a lot of spermatic firepower" would be worthwhile only if there were "some sorts of race or contest. otherwise," they write "they seem to be excessive" (1991) CITAZIONE Souped-up genitals. Spermatic firepower. now we are talking!
indication of spermatic firepower are evident in the differences between a man's first sprout and his last.
the first sprout contain chemical that protect against various kind of chemical attack. what sort of chemical attack? aside from leucocytes and antigens present in a woman's reproductive tract (more on that later) , they protect the sperm from the chemical in the latter spurts of other men's ejaculate. these final spurts contain a spermicidal substance that slows the advance of any latecomers. in other words, competing sperm from other men seems to be anticipated in the chemistry of men's semen, both in the early spruts (protective) and in the later spurts (attacking). (Lindholmer 1973) |
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