I am similar in the 80/20% category. I have no emotional interest in guys and physically I am attracted to very few. I fooled around with 3 guys when I was growing up.. meaning mutual jerking off and blow jobs (giving and receiving) which I really enjoyed. I haven't been with a guy since I was 19 (which is >10 yrs ago). However I look at this site and gay porn and would love to suck some of the cocks I see. I also still fantasize about my experiences when I was younger. However in reality I look at people in daily life and I am just not attracted to any of the men around me (friends and strangers). Basically I am straight with an oral fixation for really great cocks! I know everyone likes to label guys like me as bi, but I really think there is a difference between me and guys who feel more emotionally and sexually towards guys and girls. To be honest I don't agree with the whole label thing, as the three categories of gay/bi/straight do not cover the complexity of the scale. I prefer the percentages but even that doesn't account for the difference between physical and emotional attraction (which also not everyone agrees are different but I think is the case).
From chatting to guys on LPSG I have come across many who are similar to me (and the OP) in being "basically straight" but keen on some sexual interaction with a cock.
By the way, to the OP.. you have one amazing torso dude!