Nah, according to Tumblr, penis in vagina is still gay if one of them identifies as a different gender, or if they identify as gay.
I wish I could find the post but I remember there was one where a lot of non-binary people got really annoyed because someone said "if heterosexual means attracted to a different gender from your own, then all non-binary people and people with unique genders are straight", and they really wanted to call themselves gay. It's like the LGBT equivalent of white kids saying "but I'm allowed to say the N word because-".