While I live with a man, I am not in a heterosexual relationship, even though he is heterosexual. His orientation doesn't change mine.
I wholeheartedly agree. I live with a man and it took a lot of discussion for him to realize this. Many guys seem to take it as an insult if you are with them and you still express attractions for women. He gets it now though. He even defended bisexuals (I wasn't even there) to a group he was studying with when they went out for lunch. One of the girls kept saying that bisexuals eventually have to pick a side and then they are either gay or straight, and he patiently explained that orientation is about attraction, it's not based on the relationship you happen to be in at the time. We've also discussed having a poly relationship. We're not really actively seeking it out, but if it happens it happens.