That's discriminatory and oppressive, that I should have to ask. It should be my right . I shouldn't need anyone's permission. I don't think you'll be getting many invitations. Litigation over parties, you can't be serious.
Business is done there.
In fact, it's usually your office that's throwing the party. So if I can't invite the person I love best to stand beside me in those tense situations, I'm at a real disadvantage. I'm discriminated against in many subtle ways, because I can't have the partner of my choice as my recognized spouse. There are plenty of heterosexual marriages where they don't sleep together, literally or figuratively. Besides, sex is private.