I'm too afraid to tell my close friends this, but I need some outside advice?

I told my boyfriend that I once had a biual experience with my best friend, and then he told me that he also once had a experience. I really don't know what to think of it. I am trying really hard not to take society's standpoint on this one. I know that what I did is really the same as what he did, it just really caught me off guard! I am not phobic, but dating someone with biual tendencies and accepting a friend's lifestyle are different. When he told me, he told me it was something he has never shared with anyone. I didn't want him to feel embarred, or feel like I thought he had done something wrong, especially acknowledging how hypocritical it would be for me to think of him differently. I want to ask him more about it. For instance, I know that I am not interested in exploring anymore with it, and that my experience was just a strange thing between 2 drunk best girlfriends. I would like to ask what his feelings are towards his experience, but I don't want him to worry that I am judging him.