This latest supposed addition to the alphabet soup sadly shows the rather mistaken arguments that the lesbian and gay rights lobby used. Hence we have ended up with the attempts to make false analogies with trans and gender identity issues, and now seemingly with BDSM and 'sexual orientation' issues.
Being lesbian or gay isn't just about sex, and what sexual acts you perform. Although that was used historically to persecute gay men and lesbians. But being publically a lesbian or gay couple isn't the same as being publically into particular sexual acts (although just as with a straight couple, what acts are possible is slightly constrained by biology).
And the reason why being lesbian is 'okay' shouldn't be the 'I just am, can't change, can't help it', 'it's an innate part of my identity' argument. The real reason why the patriarchy doesn't like lesbians is because it challenges heterosexuality and the way that the private sphere is also used to maintain mens power over women. Hence no surprise if it has been twisted to be 'just' about sex, which is/should be either irrelevant to the rest of your life, or a bit of a turn-on for straight blokes. Or just another kink.....................
Male homosexuality was never quite the same threat to the patriarchy, and ancient greeks managed to incorporate it quite well into their society.
And I'll admit a part of me suspects this is former lesbian and gay rights organisations who are desperate to keep going, so now that the legalities are (mostly) sorted (as regards marriage, employment, pensions etc etc), what are they campaigning for? So finding a new group which can be made to fit using their same style of arguments, means new donors and keeps them employed. Or a take-over bid, now that gay and lesbian interest is waning.......................
From my point of view, as a lesbian don't assume you know about what I do sexually, and frankly it is none of your business! If you are prejudiced against a lesbian couple, it is frankly just sexism, because if I was the same person but holding the hand of a man, you wouldn't have the same issues. It's just SEXISM stupid! :-)