I posted the question because I was finding myself getting most aroused by images of nice, big cocks lately.
If I am looking at porn, I can find naked women very erotic and enjoyable to look at, while full body images of naked men really don't do much for me. If they have a nice dick I can enjoy them a bit more, but the male body is not something I find sexually a turn on for me.... no matter how well built the guy is!
But when the images are focused on just the cock, I find my own dick getting tingly... and my prostate even aches!
When it comes to nude female images, my interest is peaked when it includes her getting it on with a well hung man. Seeing the big cock with her hands around it, licking and sucking it, and it penetrating her vaginally or anally... that REALLY gets me going! And it is from me imagining I am in her place!!!
If it is gay porn of well hung guys getting it on, I am much less aroused.... again, the male body as a whole is not what triggers my bi desires --- its all about the cock! Close ups that focus more on the cock anally penetrating a man's ass can be hot, but showing the full bodies... pass!