Why Sexual reproduction is more popular

Hello,

I want to ask why complex animals are usual divided into sexes and are
not intersexual. I know some evolutionary explanation for advantages
of sexual reproduction against asexual, but I've never heard
explanation why sexual reproduction is not made by pairs of
intersexual individuals. I now it is popular among invertebrates why
it disappeard for vertebrates?

I will be appreciate for any help like link to a book where is an
explanation or even name of author ;).

Best Regards

Adam

.

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