It's all subjective isn't it? I'd probably put that at 20 or 30%. I put down 10% because of the subject of this post as well as my huge fetish for futanari, especially the really ridiculously endowed ones such as those featured here: reddit.com/r/hugefutanari
I'm also not squeamish around my own cum, I've never intentionally ingested it, but I'll go down on my fiancee after giving her a creampie without thinking twice. I also have zero problems kissing her after a blowjob (just as she has no problem kissing me after going down on her).
I think the gayest thing I would do is briefly touch another man's cock, provided it was truly massive, mainly out of curiosity for how it huge it would feel in my hand compared to my own. I'm not sure if sexuality can change over time, I'd honestly have no problem being bisexual, but that just isn't how I feel. The only cock I'd ever suck would be my own (if I were big enough or flexible enough to do so), or my fiancee's if her clit magically grew into a cock making her a true futanari, but I have no desire to be penetrated by her, and only find transexual women attractive when solo or with a female partner.
Some may disagree but I think that puts me at about 10%, perhaps only 1% or even 0% since I don't really find myself sexually attracted to men at all.