Interesting topic! I have a bisexual orientation- something I was born with. I have made several lifestyle choices in my life. First I lived a heterosexually monogamous lifestyle. Then, a lesbian monogamous lifestyle. Now I am living a bisexual polyamorous lifestyle.
For me, uou can have one particular orientation, but you still have to choose a lifestyle. And, just because a person is living a particular lifestyle, doesn't neccessarily mean it lines up exactly with their natural orientation.
For clarity, if someone wants to be clear, they might want to reveal both their orientation and their chosen lifestyle. If they happen to be the same, that's great!!
The key to life is in being fully engaged and peacefully detached simultaneously and authentically in each moment.