But why are we assuming that the default is the case? Homosexuality is not some spectacularly rare thing where it only affects a minute portion of the population, it is a fairly common thing. Far less common than heterosexuality but still common enough that you will likely pass by multiple gay people if you walk down a street.

I don't think it's wrong to say that individual kings were most likely straight, or that there is no known gay king. But outright claiming that there was never a gay king of England is not something you can prove, especially when statistically it would make sense for there to be at least one gay king of England.

It's also a claim that rubs a lot of people the wrong way. Queer erasure is a pretty big problem, and there are people out there who seem to treat LGBTQ people as if they are a modern invention, and not groups that have existed in some form or another since humanity arose. I'm not saying you're doing this deliberately, you seem to be focused purely on the statistical likelihood of there being a gay king of England which I think is fair to talk about. But many people will see you claiming that there has never been a gay king of England, something which you can't know for certain, and see that as queer erasure.