What I want to know is, do Sith have sex drives? Did the Emperor keep a harem of slave girls? Or are they all merely evil in the philosphical, red-lightsaber sense?
Naah, nothing like that. Obviously since the Jedi Order forbids relationships, the Sith went the opposite route. They fall in love, get married, raise lots of kids, keep dogs and cats, take care of their parents in their old age, have lots of picnics and barbecues with all the neighbors, and slaughter anyone who messes with their family.
Well, here's the thing: agree or disagree with the policy, there's a certain logic in having the Jedi abstain from raising families and living normal lives, as it allows them the maximum freedom and efficiency in serving their purpose of facilitating peace and helping others as best they can.
But what is the Sith higher purpose? Hurting others? Or ruling over them? And sure, the image of a family man Sith seems absurd, but if you're not going to start a dynasty, what's the point of ruling? Alternatively, if you're not going to get laid in every way you could possibly think of or want, what's the point of ruling over entire star systems and/or living forever?