Here's something to think about;
I think it's fairly well established that LRH had a very strong interest in Crowley's magical system from a young age. The OTO, which is the occult order that Crowley revamped. is supposed to have homosexual acts as part of some of the upper grades.
Crowley also directed his disciples to perform 'unspeakable acts' in order to destroy the ego or something in some twisted way.
His oldest son also insisted that the dude would have sex with anything. Would he make something like that up?
So, I think it's a pretty good bet that the guy participated in perversions of all sorts.
Crowley's ideas about what was unspeakable might have been very different from Hubbard's, or from yours. I have read a few of his books, though I'm not claiming to be a Crowley scholar. My reading left me with the feeling that those sorts of statements (like his statement about strange drugs and wine) were intended to get people to start "thinking outside the box", rather than as specific guidelines for people to adhere to. Homosexuality was considered a sin by the dominant group of the time, and so he recommended breaking out of their value-system by doing the acts they were so opposed to.
I don't think it's a good idea to advise people to do specific things that are violations of group understanding, necessarily (yes, Mark, I know), but I do think it's good advice for people to step outside of the box, because all of the values we're supposed to adopt and follow are very rarely intelligently thought out, and many of them are actually mutually exclusive.
Timothy Leary advised people to drop acid, under controlled mindset and environmental setting, in order to accomplish this, as well. For some people, this causes great anxiety. Prior to dropping acid, myself, people who dropped acid scared me, filled me with dread, because they had an experience that was obviously important to them, but that I couldn't understand. It threatened me, or I felt it did, because I didn't like the idea that my perspective was limited due to my unwillingness to do things that were specifically forbidden. After dropping acid, I no longer had that feeling. Would I recommend it to everyone? NOOOO. However, it did help me step "out of the box".
Crowley and the OTO seem to have been trying to get people out of the box, too, through such means. If there were better ways, I'd accept them.
For me, Hubbard's sexuality was an irrelevancy, except that it contravened his spoken and written words. Hypocrisy and Hubbard often go hand-in-hand, though.
The only valuable thing I might have to say to people who are coming out of the Church, or looking at its views is this: if you are gay, or bisexual, or have any other sexual trait which makes you "different" from heterosexuals with defined sex-roles, Scientology will consider such things deviations, aberrations, needing address through processing. Avoid the Church for this and many other reasons. I have no problem with you wanting to explore these sorts of issues "in session", but don't accept others' views of your sexuality as a basis for your own views! Be who you are, and celebrate it!