They might be paired often enough because Minako and Rei tend to be paired together. Particularly if the relationships don't extend beyond the sailor senshi themselves. And it's not uncommon for fan-fiction authors to take one instance of something and consider it imperial evidence despite the lack of logic or even an existing contradiction. For instance, at the end of the manga, Mercury and Jupiter are killed together, and then Venus and Mars are killed together. And out of the inner senshi, Rei and Minako have the most dynamic relationship, so it probably makes the most sense to pair them up. And that leaves...
There are probably all sorts of reasons for why the arrangements end up being what they are, though.
Spica75 wrote:Dislike for the opposite sex does not mean being homosexual. Just as attraction to same sex doesn´t have to mean that. Attraction isn´t a single dimension.
When did I ever even imply that? (I even made a point of it before, about how girls in anime and manga can show admiration for other girls without it being sexual.) I thought I made it pretty clear at the beginning of my last post to not come to any conclusion based just on that as established fact, and that it was about working with reader believability first and foremost.
For the two characters in question, I said it's more believable for them to be bisexual or homosexual because -- unlike the other characters -- there really isn't anything in (manga) canon that someone could point to and outright contradict the idea. If they say, "that's not canon," you can counter with, "neither is your disagreement to the contrary."
In Hotaru's case, while being overly attached to Chibi-Usa isn't necessarily a sign of bisexuality or homosexuality, and heterosexually is usually assumed in general, there's nothing that explicitly supports the third and there's at least something that could suggest the first two. In Rei's case it's a bit more straightforward: if she's not interested in men, her options are to be celibate, find company in the arms of another woman, or change her mind about the opposite sex at some point. As an author you have these choices, and if you're looking for some lesbian action then the choice to pick out of those available becomes clear.
This is by no means a one-dimensional process. If it were only about what the author wanted, then yes, and we would likely help perpetuate the creation of stories based on faulty logic, ignorance, and blinding desire. But there's also what canon provides (or leaves open), and what the audience expects. And while one could argue that Hotaru should be heterosexual because that's what the audience expects, one of an author's many possible jobs is to surprise and/or impress the reader, so they're left thinking that the author knows what they're doing. Not necessarily to the point where they accept something as being fact, but acceptable enough within the context because there's no good, rational argument to assail it with.