When I first started watching porn I wasn't interested in the guys' dicks. I just watched the girls get fucked by them. But after watching porn for years I've come to find some dicks sexy, too. A big, shaved dick can be pretty sexy.
I like watching blowjobs and cumshots the best, and in many cases you can't see any part of the woman except her face -- and that cock is the only genitalia in view. I can get turned on by pics of just the girl sucking a cock, so yeah I can get turned on by a sexy dick. I usually imagine the girl sucking my cock, but sometimes I wonder what it's like to be the girl and suck that dick. Sometimes it looks like it would be fun to suck the dick and taste the cum (I like the taste of cum, having tasted my own).
I'm not interested in any other part of the guy, though -- just the dick. And his dick has to be shaved because the pubic hair is a turn-off.