Thanks for playing, MarloweC!
I think you are reading a lot into the writing that isn't there.
And of course there are no value judgements implied in whether someone prefers to bottom or top. There are only 12 endings and I think you are putting a lot of weight on a small number of observations.
But, your feedback is noted. I hope you enjoyed it at least a little bit.
No, I did not enjoy it at all. I was immensely disappointed. I thought I would enjoy it when I saw that I had that option, to say that I like being tied up. But it turns out the MC's personality is far too set in stone for that option to make any sense. I'd honestly be less disappointed if I simply never had the option to even try to play the character I wanted.
If the options are literally nothing more than difficulty settings, then don't include any text besides the difficulty parameters. Nothing about them can be misconstrued that way.
If none of the endings should be construed as bad, then... uh... don't call them bad endings? I thought that would be obvious.