Can you have sex with anyone that is pleasing to you, even if they are not the prescribed gender for you?
I am happily married to a great guy and I have also been in a long term relationship with a woman as well. For the longest time those were the only two people with which I've had sexual relations. According to this site, that makes me heteroflexible and it is a term that I think says it all.
I think "heteroflexible" is a very good term. I say this because my husband and I have recently started exploring with some long term friends of ours. We started out with being naked with each other, and that lent itself to sexual scenarios. My husband is strictly heterosexual but doesn't have any problem with being around the other two husbands. He just does not want to be touched by them. No wiggle room on that, none whatsoever and I tease him about being a party pooper. He threatens to spank me and I tell him I might like that.
It's an entirely different story with my two women friends. This is where the "flexible" part makes heteroflexible so appropriate. Both of my women friends are pleasing to me on so many different levels. Intellectually, socially, their outlook on life, and their thoughts, feelings, and senses of humor, are very pleasing to me. Taking it that extra step and having them please me, and me them, sexually, feels natural.
So, yes, I think you can have sex with anyone that is pleasing to you. It has to be a two way street to work, but it does work with the right people.