noplato's list would have to be kept by the police, I think. If any other organisation kept such a list I think it would be vulnerable to data protection act - men would be able to demand to see what information was held about themselves.
i think it is a very, very good idea.
many rapists who get away with it once no doubt do it again with the same MO. If the cases could be connected quickly they could be caught.
Look at that taxi-driver Warboys, he had possibly 100s of victims, almost all of whome didn't report it, any single victim making a report was very unlikely to lead to a prosecution (it was late night pick ups, he looked for women who had been drinking, in addition he drugged them, so evidence hazy,identification was difficult/impossible all the normal problems) but as soon as a few victims did report it, and the police then realised that they had a serial rapist on their hands, they caught him quite quickly.
and then when women realised they WEREN'T the only victim, many many more were able to came forward.
a cross-reference list of allegations, a secure one, would have caught him,
PLATO'S LIST
This should be a Mumsnet Campaign.