I guess I think that my point still stands. The existence of legitimate reasons does not rule out or make less likely illegitimate ones.
The main way I think this topic goes wrong is becoming a trial. In a trial you are looking for definite proof of unacceptable (and ideally illegal) misconduct. This is not a trial question, IMO. If you find out the girls have been in the boys room while at band camp, you can probably guess the reasons or at least the outcomes in a large enough portion of cases.
The system needs to be preventative. Elected officials in particular need to have no legal way of accepting this kind of money.