When DD was 4, we visited friends who were temporarily living in Norway. They won a "boy baby doll" as a door prize and gave it to DD, as they had no young children. Well, well, well...... Baby boy had VERY anatomically correct parts and if you filled him with water, he would urinate. But....and here's where it gets good.....You had to jiggle his bits and pieces to get the wee to start to flow.

Just get a mental image of THAT.
Your little girl's hands on the boy dolls very realistic "parts," flicking them back and forth to make the doll wee.

Truly, I did not want to encourage DD to mess with man parts.

Before it was all said and done, my friend's older daughter's were calling their friends over and THEY were playing with it the most, falling over in fits of laughter.

Between the fact that I did not want that thing coming home to Texas with me and the fact that it must have weighed 15-20 pounds and we still had a few more European countries to visit, I "accidentally" left the doll behind when I packed my suitcase. From what they tell me, he provided hours and hours of amusement.
BTW, the Norwegians claimed no responsibility for him. He was from some Eastern European country.
