From what I understand of human sexuality, an interest in having sex with your non-preferred sex one time is normal; an interest in repeating that experience would place you firmly in the bisexuality camp. Some people characterize it as pansexuality or omnisexuality, but those terms are usually used for people for whom consent may not be a requirement. I'm guessing that this man you fooled around with gave consent.
Just saying: nobody actually asks questions like that for a "friend".