(in the US) The burden is placed on the prosecution.
"Beyond a reasonable doubt" in a criminal case, "A preponderance of the evidence" in a civil case. The advocate of a case always has the burden of proof - the prosecutor in a criminal case, the plaintiff in a civil case.
In both cases, the moving party bears the burden of proof. In a criminal case, that is the government. In a civil case, that is the plaintiff.
Burden of proof is who has to prove the case by meeting or exceeding the standard of proof. In a criminal case, it's the prosecution. In a civil case, it's the plaintiff. Standard of proof is the unquantifiable amount of proof that must be shown. In criminal cases, it's beyond a reasonable doubt. In civil cases, it's a preponderance of the evidence.
The burden in a criminal case is: "Proof beyond a REASONABLE doubt." Many people mistake this to mean proof beyond ALL doubt, but that is a mistaken understanding. There is no way to establish proof beyond ALL doubt, we can't even prove, beyond ALL doubt that God exists.
The so-called "burden of proof" is the burden that the prosecutor (in a criminal trial) or the plaintiff's attorney (in a civil trial) must present to a judge and/or jury in order to convince them that the event DID occur, and that the defendant (criminal) or respondant (civil) is the one that did it.
The "burden" is in proving that the sexual contact did take place and that the victim was a 'minor' at the time of the offense. The same 'burden' of proof as with any other sex offense, or criminal case.
In a misdemeanor case, the burden of proof is typically "beyond a reasonable doubt." This means that the prosecution must prove that the defendant is guilty of the crime charged to a high degree of certainty.
The state/ District Attorney
Prosecutor
There would probably be more convictions.
The state or prosecutor bears the burden of proof. You are legally innocent until proven guilty.