I don't believe Pac got raped because outside of Wendy Williams and a Mobb Deep song, there is no other evidence of it happening.
We know exactly who shot him, who made the order and why but we have no info on the alleged rape.
If Pac was raped how come we NEVER heard from the people who raped him?

When a prisoner gets raped they have to go to the hospital ward in the prison. So there would have been paper work of his injuries right?

How come we never heard a name from other inmates that witnesses or heard rumors while locked up?

Where are the prison staff members who witness the act or the aftermath?

How did he get raped if he was in P.C.?
After 20+ years and there is still no proof?