The male penis and scrotum are external, whereas the female sex organs are placed "inside" the body. As females have the bladder, rectum etc. just like males, does this mean overall females have a larger volume of organs? Is this why females have wider hips — because the male penis and scrotum are external appendages just like female breasts?
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.