Bonobos engage in sex in virtually every partner combination (although such contact among close family members may be suppressed) And sexual interactions occur more often among bonobos than among. Homosexuality has been documented in more than 450 species of vertebrates signaling that sexual preference is biologically determined in animals From male bonobos that hang from trees and engage. Homosexuality in bonobos is not cultural. Female dolphins engage in clitoral stimulation using snouts, flippers, or flukes, and male dolphins rub genitals and sometimes engage in penetration.
In bonobos, fruth and hohmann [6] found no clear evidence that female homosexual behavior incited heterosexual copulation activities
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