There's three of these scenes with Violet (C5, C7, and C11) that contain both straight and lesbian variations, but if you've declined Nick's advances then these scenes will not even be mentioned for the entirety of the game. By deciding not to go through with his swinging idea, that part of the story never happens in the first place.
Romance will play a big part in the game, with the option to take a boyfriend or girlfriend at the end of Act 2. Act 3 will then see these relationships in detail, and I have plans to add special romantic endings as well.
Of course, it's also possible to keep her single for the duration of the game, or to have her not be entirely faithful - potentially leading to a harem outcome.
Though I haven't fully decided the male romantic options, Josh or Connor (or both simultaneously!) can safely be confirmed.