RealDiversity
In my case I have been put in the awkward position of working with 4 male coworkers on a project I knew nothing about, I was getting paid the same as them while contributing nothing to the project. I felt humiliated and asked to be paid as an intern but my manager just smiled and said I was there for support and that my coworkers enjoyed my presence on the team as it was "A breath of fresh air to have a female in the work place". I quit the next week.
I am a female and I just hate it when a company recruiter says he can get me a job in a position I know I am not at all qualified for. Additionally I got scholarship money when going to school when those much more dedicated than me did not simply because they had something hanging between their legs.
Google employs 30% females (http://www.google.com/diversity/at-google.html) Facebook employs 31% (http://newsroom.fb.com/news/2014/06/building-a-more-diverse-...) Amazon employs 37% (http://www.amazon.com/b/ref=tb_surl_diversity/?node=10080092...) LinkedIn employs 39% (http://blog.linkedin.com/2014/06/12/linkedins-workforce-dive...)
Obviously these companies need to hire employees to do non-engineering tasks and in an effort to seem "diverse" They likely hire only females for these jobs. It would make sense that the company had 20%/80% doing actual engineering work as there is no reason females cannot do just as good a job with the same experience. That means that half the females hired at these companies are doing non-engineering work which pays lower. This would account for the pay gap. When people ask for further diversity at these companies and equal pay what they are asking is to give an unfair advantage to the less qualified.
I am aware this is an unpopular opinion but I felt I needed to post it as I saw someone else posted it and then took it down after being harassed.