This will sound stupid but I hear the term biromantic a lot but I don’t know what it is
Hello! It does not sound stupid.
Biromantic means being romantically attracted to 2+ genders, but not sexually.
So, for example, an asexual may use the term to describe their romanic attraction towards certain genders but to also state that they do not feel the need to have sex with them.
I hope this helped!