Someone who is attracted to the opposite sex, but occasionally can be attracted to the same sex.
A heteroflexible person can enjoy watching boy on boy
porn, but wouldn't do it in real life, could occasionally fantasize about males while masturbating, etc.
A heteroflexible couldn't imagine a
future with the same sex, and it's not on the same level as the opposite sex they are attracted to. They constantly have identity crisis, sometimes they feel homoflexible, during
high sexual drive, which is the opposite of what heteroflexible is, sometimes they just live their life as
normal.
It has more connection to pansexual than it has connection to
bisexual, if anything it'
s a modern word for
bi-curious.
That being said a heteroflexible could lay down with the same sex, but it would be nothing more than "just having sex". It's situational, and they don't actively search for it, they could feel attracted just because they had a "good talk".