In that case, the question was worded wrongly:
If you (as man) where left with a woman and a sheep as last mammals on this planet, which one would you kill (e.g. for diner), and which one would you save to inherit/repopulated the earth
short answer: kill the sheep for shoarma, after 7 year itch, you might get hungry again...
So, other than reposting a bunch of random, unrelated stuff from other people, what do you have to contribute?