Just so you know how I approach things I am theoretically bi.
I feel an emotional attachment with women but sexually I love cock.

Now on to the topic.
I started off on my love of cock/cum through straight porn.
I have a vivid memory of getting hold of a video at the age of 16 that was a big "roman" orgy.
In one section Rocco Siffredi stuffed his rather thick cock in some womans arse and that just fascinated me.
A short time later I started playing with my hole in the shower imagining I was getting fucked and every porn film I have ever seen I was always putting myself in the womans position and feeling jealous of them for getting the fuck that I craved.

Gay porn on the other hand is either very niche, fisting for instance which doesn't do anything for me, or rather gentle and lovey dovey.
If the kind of savage sex that the straight industry puts on film ever turned up in an all male film it would be yanked off the shelves in seconds.
One scene springs to mind in Rocco Ravishes Ibiza when this english girl gets arse fucked so hard that she begs for them to stop at one point and they ignore her, they may not have heard her as she was out of breath and quite quiet at the time, then at the end of the scene she looks like she is in shock.

Thats probably what has created my submissive attitude.
The idea that somewhere, someday I will get fucked like that.
I also tend to refer to it as my cunt instead of my arse.

Of course all this could be interpreted as my advert asking for harsh, violent butt sex.
I can't deny that it is what I;m looking for.

I like both gay and straight porn. Like you I love the straight porn when the cocksucking scenes are on or if the gal is getting fucked the the ass. I always fantisize that it is me sucking on that lucious cock. Lose interest during the straight sex scenes when his cock disappears into her pussy.