Pencontraromantic is a romantic orientation in which one is romantically attracted to all genders except the "opposite" or "other" of their own.
For example, one who identifies as a girl may be attracted to all genders except boys; one who identifies as bigender girl-boy may be attracted to all genders except non-binary ones. Up for interpretation as far as which gender(s) are the opposite(s) of one's own.
Pencontraromantic may be considered the opposite of penultiromantic.