People are attracted to gender expression first and foremost before knowing the “sex” of a person. My gender is Female my sex is Transsexual. People that are attracted to me are first and foremost attracted to my gender identity as Female and some to me being Transsexual. But gender comes first. Now if someone identifies as male and is attracted to my gender as female then he is expressing a hetero-gender orientation. If the organs are two penii that may create a sense of homosexuality BUT if the people identify as both being opposite genders then it’s best to just understand that there is a hetero attraction there. It’s the gender identity that counts the most not the sexual organs. Maybe a safe term for that person is heteroflexible but that’s just another label to add to the mix of so many. Maybe it can work, maybe not… but it is used. For the sack of simplicity… the couple would be a straight couple.
Now from the other perspective a person who identifies as gender Female and another person as gender Female and one of the partners is Transsexual it is best to understand that this is still a Homo-gender, Gay/Lesbian relationship.
Not all Transsexual people have Sexual Reassignment Surgery because either they are comfortable with the organs they have, that can’t afford it, or technology is advanced enough yet. For these people sense we honestly do not look between people’s legs on a regular basis and we shouldn’t unless they are our partner or experimenting… then it is best to understand the gender attraction over the sexual organ attraction.
Transsexual Female + Female = Lesbian couple ~ Homo
Transsexual Female + Male = Straight couple – Hetero
Transsexual Male + Male = Gay couple ~ Homo
Transsexual Male + Female = Straight couple – Hetero
Also take into account that any one of these partners could be Bisexual, Pansexual, or Asexual… and maybe identify as gender Gender-Neutral. But these are the basics.
Transsexual Male + Transsexual Male = Gay couple ~ Homo
Transsexual Female + Transsexual Female = Lesbian couple ~ Homo