Just thought I might mention that the game Undertale has a yuri couple in the main cast (Undyne x Alphys). Plus one of the minibosses can be beaten non-violently by getting the two male opponents to date one another. You can actually see them on a date at an ice cream stand afterwards. Plus the ambiguously gendered protagonist has the opportunity to date a male and a female character during the course of the game, so I suppose that's one type of gay or another.
That might not be enough to make the list, but I thought I would give it a shot. Honestly, Undertale is just so odd and charming and wonderful that I want everyone to play it.
Undertale is a brilliant game. GOTY 2015. Not many games can make me cry. But this game... God damnit. That final boss fight and the true ending was the most satisfactioning ending I ever witnessed in any video game. Toby Fox is a genius. And yes, Undyne is the badass lesbian monster. A True Hero.