What's inside the males body in the space where females have the ovaries and the uterus?
Wider hips in females is not contributed because of large volume of organs. 

Broadening of the hip bones happens as a feature of the female pubertal process, and estrogens (the overwhelming sex hormones in females) cause an enlarging of the pelvis as a piece of sexual separation. Consequently females for the most part have more extensive hips, allowing labor.

However, I found this article from International Business Times that states >>


  Women have not evolved wider pelvises despite it being difficult and
  dangerous to give birth – yet they may have developed some physical
  features that help during labour.
  
  Barbara Fischer, from the University of Oslo, has found a link between
  pelvis shape and statue and head circumference of both baby and
  mother.


There was, however, no sufficient evidence to back this article, but it is quite an interesting approach otherwise.

Males are not needed to have any extra organs, but females have just more space in the pelvis region. That space can be linked to idea of uterus expanding to hold the fetus during gestation as mentioned by @BryanKrause.