I disagree. If there isn't a cock, than it isn't porn. Just for clarity, no homo.
I suspect you are joking, or I hope you are.
Here is the definition of porn (there is no mention of cocks, per se).
Simple Definition of pornography
1: movies, pictures, magazines, etc., that show or describe naked people or sex in a very open and direct way in order to cause sexual excitement
Full Definition of pornography
1: the depiction of erotic behavior (as in pictures or writing) intended to cause sexual excitement
2 : material (as books or a photograph) that depicts erotic behavior and is intended to cause sexual excitement
3 : the depiction of acts in a sensational manner so as to arouse a quick intense emotional reaction <the pornography of violence>
http://www.merriam-webster.com/dictionary/pornography