Sheep won't argue about whose turn it is to go get a towel. Sheep won't drink your liquor, smoke your weed, snort your coke, and then tell you they have to be home early. Sheep never ask if you're ready to settle down. Sheep never ask about you former lovers and then get pissed off when you tell them. No matter how old or ugly you are, you can always find a willing ewe.
Sheep are never concerned about their reputation.
Sheep won't tell all their friends about the time you couldn't get it up. Sheep won't ask if you're gay, when you can't get it up for the second time. Sheep never insist on eating out. You'll never catch your sheep masturbating to a picture of Mel Gibson. Sheep don't get suspicious if you have to work late.