When the science catches up with the fiction, does science fiction (SF)transmute somehow into 'normal' fiction, whatever that might be? Take forexample, a theme like sex in space. This has been explored ad infinitum insub-genres ranging from swash-and-buckle space opera to social allegories andmagical fantasy. Everything from the pros and cons of floating upside-downweightless while performing coitus, to the effects of low gravity on the humanreproductive system has been discussed in (occasionally disgusting) detail.