The gonad most likely to function is the ovary.
[13] The ovotestes show evidence of
ovulation in 50% of cases.
[14] Spermatogenesis has only been observed in solitary testes and not in the testicular portions of
ovotestes.
[15][14] According to a 1994 study, spermatogenesis has only been proven in two cases.
[16]
Spermatogenesis is never present in cases with XX.
[13]
There is a hypothetical scenario, though, in which it could be possible for a human to self-fertilize. If a human
chimera is formed from a male and female zygote fusing into a single embryo, giving an individual functional gonadal tissue of both types, such self-fertilization is feasible. Indeed, it is known to occur in
non-human species where hermaphroditic animals are common.
[19] However, no such case of functional self-fertilization or true bisexuality has ever been documented in humans.
[15][10]
In recent years the term hermaphrodite has been falling out of fashion since there are no documented case of a human functioning as both male and female.
[20]