Male Identity in "Children of Men"

In Children of Men, the main protagonist, Theo, does not conform to the typical male stereotype as he is nurturing and protective of Kee, whereas the other male characters of the film do, for example, Sid conforms to the stereotype of men being violent and aggressive, which can be seen when he helps Kee, Theo and Miriam out of the van, and again when he sees the baby and chases Theo and Kee out of the house. The 'Niagra' advertisement is another example of male stereo-typicality because it is aimed towards men - it sounds like viagra. Finally, another character who conforms to the male stereotype is Theo's brother, who sits in his house and does't take any interest on anything that is going on outside.