Although valid, What simplistic questions like this fail to uncover is the range of human sexuality. People do not generally fit in perfect boxes, despite the fact that it would make it easier for us, if they did.
I do think that men with cuckold leanings, desires or those of us who have acted on this in general have a higher degree of bisexuality in them then your average joe. Having said that though, there are very few so called heterosexual men or women that have never had a curiosity, passing thought or desire for someone of the same gender at some point in their life. This goes back to research done in the 1940s even, a time when it was much more taboo to mention these things.
Gay or closet homosexual cuckolds I'm not really sure is that common. You can't easily be gay and spend a significant amount of your life dating women and/or married to one. It does happen by those wishing to act out a hetero life, but you certainly don't meet a lot of these people Gay people have not great attraction in a sexual way to those of the opposite gender.
Which leaves us with bisexuality. For me being a cuckold does afford me some attraction and contact with the man that is fucking my wife. I do suck his cock and nobody forces me to do that. I lick his balls as he fucks my wife. Quite the contrary the willingness of a guy to at least tollerate this if not enjoy is essential in anyone that we screen as a potential partner.
However I have zero interest in having that man reciprocate and give me oral sex etc. He needs to show his affection to my wife. Also white guys in general are not attractive to me. Go figure. I have talked to a lot of men with in the same boat here and on other sites. I love women and am very attracted to my wife. So there you have it an opinion of a cuckold for over seven years.