Maybe our society has approached sex, rape, underage sex, etc in a totally incongruent manner in relation to what is more real and natural. Maybe, somewhat like religion, sex should be separate from government and laws. It appears trying to bring some form of justice for the said victims hardly ever gets accomplished and ruins the image of all involved, usually disintegrating down to a level of he said/she said.
If there were no laws regarding sex, and we stopped prosecuting so-called sex crimes, we could and would be forced to go after the perpetrators for more straight forward easy to convict physical crimes of kidnapping (forcing someone to move to or remain where they do not wish to, assault & battery (beating/hurting others), public lewdness (exposing oneself in public), etc. If this was done, it removes the need to prove any intent of the victim, plus whether a victim consented or not. No one asked for or invites battery on themselves. And the victim's past history (ie. sexual) has nothing to do with anything, so is never mentioned. I think nearly all victims of physical and emotional abuse would feel free and anxious to prosecute their attackers if the sex angle was totally removed. It is the stigma of a sexual attack, plus the threat of the defense disgracing the person involved by their past actions, which scares and prevents more people from going to the police to report it.
It just seems to me that you remove most of the obstacles that interfere with the criminal act or rape being prosecuted. Now I know there would be thousands of things to address in approaching such an idea, but this was just a thought in general of how not to hinder the prosecution of criminal acts against others through limiting a DA´s options.