Not so much for bihacking, but definitely for trying to affect one's sexual orientation in a more general sense. Mostly this involves gay people trying to become straight, or straight people trying to become gay. (Note that opportunistic same-sex behavior is actually pretty common wherever there is rigid sex segregation, e.g. in fundamentalist Muslim countries, or among prison inmates. But it's not like these folks are happy having gay sex; and indeed, they will go right back to their previous sexual orientation as soon as the rigidly-segregated environment is removed.)