Here is an interesting essay (seems to have been written by a college student) which explores the topics of sexual repression and its relationship to blood and blood transfusions featured in the 1897 book Dracula:
The Importance of Blood during the Victorian Era: Blood as a Sexual Signifier in Bram Stoker’s Dracula by By Nilifer Pektas
http://sh.diva-portal.org/smash/get/diva2:16204/FULLTEXT01.pdf
Since many of the WT leaders (notably Fred Franz) were born or grew up in this time period, this sheds some light on how they may have been preconditioned to view blood.