IMHO sexual history of BOTH should be disclosed. Those who play fast and loose have a certain M.O. ,as do those of easy virtue.
In the Evans case, the young woman involved had a habit of getting inebriated and offering herself, supposedly having no recollection of her behaviour.
In light of that, if she can't recall giving nor denying consent she leaves herself open to scrutiny by the defence by said behaviour, unpalatable though that may be to some.
We all have to take a certain amount of liability for our actions when alcohol is involved, unfortunately.