Final answer:
The references provided do not confirm whether Cesare had an STD that led to his demise. They discuss various historical events and touch upon the limitations of antibiotics in treating genital herpes, a viral STD.
Step-by-step explanation:
Regarding the question of whether Cesare has an STD that killed him, the provided references do not give clear evidence to support this. Instead, they discuss various historical scenarios, such as ancient Roman laws regarding adultery, witchcraft accusations against Germanicus, and the tragic story of Lucretia from Livy's Ab Urbe Condita. Additionally, a discussion on the effectiveness of antibiotics for treating genital herpes is presented, which reveals that antibiotics cannot be used for viral infections such as herpes, implying a distinction between treatment options for different types of STDs.