The Bikura are sexless.

[twaddler (imported)]

Not celibate or herma-phroditic or undeveloped -- sexless. They are as devoid of external or internal genitalia as a child's flowfoam doll. There is no evidence that the penis or testes or comparable female organs have atrophied or been surgically altered. There is no sign that they ever existed. Urine is conducted through a primitive urethra terminating in a small chamber contiguous with the anus - a sort of crude cloaca.

Beta allowed the examination. The reedscanner confirmed what my eyes would not believe. Del and Theta also agreed to be scanned. I have absolutely no doubt that the rest of the Three Score and Ten are equally sexless. There is no sign that they have been... altered. I would suggest that they had all been born that way but from what kind of parents? And how do these sexless lumps of human clay plan to reproduce? It must be tied in with the cruciform in some way.

When I was finished with their medscans I stripped and studied myself. The cruciform rises from my chest like pink scar tissue, but I am still a man.

For how long?

-- from 'Hyperion' by Dan Simmons