Hi Jantastic.  I applaud you for having an open mind about your daughters relationship.  Many parents would have a very negative reaction to hearing from their daughter that her boyfriend is bisexual and this could have a potentially significant impact on the child's willingness to talk about sensitive topics.

I can only speak from a parent's perspective on this one, but I think my primary concern in this case would be the health and mental well-being of my child vs. any sort of judgment as to whether or not it is appropriate or acceptable to date a child of the opposite sex that is bisexual.  Is the relationship monogamous?  If it is, then I would focus on making sure your daughter feels comfortable with herself and that the relationship does not cause her to question herself, cause any anxiety, or result in a lasting social stigma.  If the relationship is not monogamous, I'd be very concerned about the risk of sexually transmitted diseases and the impact it could have on your daughters social and emotional well being, as well as her approach to relationships in the long run.

I suggest having a very frank conversation with you daughter about the importance of monogamous relationships and how best she can protect herself both physically and mentally in the current relationship.  Good luck!!!

ok so im 16 as well and bisexual so ik about this stuff. i want to make one thing very clear, just because he is bisexual doesn't mean he is going to fool around with other people. strait people are just as likely to cheat on someone as someone who is bisexual is. if he loves your daughter and wants to be with her and is a good kid he wont screw her over, end of story.