And Alex Hirsch has definitely been trying to put in LGBT stuff. In the original storyboards for the Love God's introduction scene, he sets that old lady up with another old lady. It didn't make it through, but he's definitely been trying.

You’re right! Here are the storyboards. Pasted below are the relevant ones.

Alex Hirsch got in an adorable lesbian old lady couple up to the storyboards before it got censored.

One day, Alex. One day.