ok this is what i know about this subject.
i believe women go to these Gynecologist or whatever its called because of the risk that young women have of developing ceivex cancer (i know its spelt wrong). i only know this cause my mum is a nurse or something and tells me stuff i don't want to know.
and yes i do believe that they have the equivalent type of doctor for men as well. except i don't think many ppl know about it. and since men don't talk about their health alot, and its not well known. we usualy are oblevious to the risk men have also, and believe it or not men have a risk of developing prostate cancer. although u can get it removed there is a great risk or men losing there so called "man hood". and to detect this cancer i think the go into ur "rectum" which HolderOfTheDarkChalice stated. but i think men in there 40's and 50's onwards have a greater risk of developing this cancer. so thx god i wont be having anything stuck my rectum any time soon.