WI STAT 948.02(2) says if she is not yet 16 and you have intercourse it is a class "C" Felony.
If the parents don't act then they fall under 948.02(3) and it is a class "F" felony.
Further, even if you were married it still is against 948.02(4).
So, my answer is NO not until she is 16 at least.
Both answers are correct. See the following link: