Kinda odd this thing is with lawmakers publicly. You would think every PD has an internal policy that their officers can't bang prostitutes unless dire situations warrant it. However, I believe some things should not be public knowledge (i.e., how far undercover officers can go), and this applies to others areas as well. Once the individual or individuals know what the break point is, they have an advantage. I don't think any LEO simply trying to bust prostitutes or pimps needs to actually go through with the sex act ...I believe in general prostitutes insist on getting paid upfront.
Now, major and I mean major criminal activities, and not just prostitution alone, could potentially require this to occur (e.g., major drug distribution, organized crime, etc), whereas if a undercover officer didn't do this, it could potentially risk blowing his cover or potentially result in death by the criminal elements involved. But again, If this were the case, which I doubt, why make it public knowledge.
You got to really ask....is this really a problem in Hawaii that needs lawmakers attention?