Okay, not knowing anything about that case, if someone was accusing a defendant and the only way to surely exonerate them was examination of their privates, how would things proceed? Would a doctor examine the kid and testify? I certainly agree that pictures would be inappropriate. Even digital pictures in criminal evidence are likley to leak out eventually.
I would think that would benthe best way. In my case, the evidence was largely irrelevent, asbthe victim (a 6 year old girl) didn't exactly give a detailed description of what the perp was sticking in her mouth. Defense lawyer was trying to ask for more details, but I believe the girl honestly said she didn't look at it "really closely." Girl testified he "peed white stuff on her shirt", and DNA matched (defense argued the perp used her dirty shirt for private solo entertainment).
As to the issue, absent some kind of sigjificant scarring, defect, or such, I can't imagine a photo, or examination, would make all the difference. But a witnessed doctor examination would be the best way, and probably best protect the rights of an accused...