Quincey Morris, Arthur Godalming (Lucy Westenra's fiancee), John Seward and Van Helsing are all present when 'purifying' Lucy.
Van Helsing carries out blood transfusions whilst the men volunteer to give blood in order to restore Lucy back to her healthy self.
No she did not sleep with anyone (even Arthur since she died before they actually got married).
Dracula uses a lot of implicit sexual imagery in the scene of Lucy's purification and the stake that Arthur "drives" into Lucy is a symbol of a man's *****. Yeah i know...
Read it, it's a really good novel, i'm studying it for my A-level exam.