I have no romantic feelings towards the same sex but I do masturbate to gay porn, is this common?

Hi /r/gayNot sure if this is the correct forum to post this but here goes.The title pretty much explains it, but it's a little more specific than that. Here are a few more details. I'm 28, virgin who has only had a few relationships with women. Currently totally in love with a girl I'm living with, it's going well so far.This started when I was about 21.The gay porn I sometimes masturbate over (I'd say it's about a 15/85 percent split in favor of straight porn) is usually quite selective, I have a handful of "go to" videos if the moment arises.And I also sometimes masturbate on gay thoughts alone, this is always a choice of three former friends from my past who I don't see anymore, never had feelings for them when we hung out when I was around 16, again, this all started when I was 21.I use to feel deep shame and guilt when I finished, now it doesn't bother quite so much but I certainly loose all horny-ness the moment it's over. And I'm 98 percent certain I wouldn't actually do it.Any thoughts on this would be greatly appreciated. I guess I want to know if this is more common than I think. Thanks for reading.