1, sounds correct to me... I've never actually done a playthrough where I burned the Vamps though... Why would you even think of doing such a thing???1. If you burn the vamps you do not get Oksana quest line. Is this correct?
2. If you let tne vamp live you do Oksana quest line but can you face the master without her? Not risking her getting killed.
3. Can you have sex with others beside Erevi's daughter and the goblin daughter? Thanks for any input.
2, you have to face the Master with Oksana, but there is no risk she dies if you remember to equip her with a shard ring.
3, you can have sex with lots of others, there are a lot of women in this game.(if by "others" you mean daughters, then no... only two so far)