That reminds me of that episode of Star Trek The Next Generation where they rescue a colony of Space Irish who were on a planet about to be destroyed, and not far away they also find some other colonists that are apparently related to the Space Irish but the second colony only reproduces by cloning. They've been cloning themselves so long that they find the idea of sexual reproduction to be primitive and distasteful. However it turns out their cloning method is breaking down because they keep cloning from the same samples and losing fidelity in each generation, and they need new genetic material to survive. So Picard dumps the rescued colony on them and tells the clones they're going to have to learn to hold their noses and do the nasty with the Space Irish. </mikestoklasa>