the vamp and the human need a good relationship first of all. then (if your the vamp) you click the human and click on the interaction "drink" it will have another choice which is "offer to turn". if your the human you click the vamp and can "ask to turn" im not sure how to offer the vamp to drink from you though.
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If you mean what is the name of the Sims 2 game its called the Sims 2 Nightlife that's the one with the vampires.
bite peoples necks and drink there blood....
Yes
The same way any two sims can marry in the Sims 3
You need the Sims 3 Late Night Pack. Then you must be turned. Finally, you have to befriend your prey in order to drink the blood.