For years humans have been categorised into male, female and the occasional hermaphrodite and human sexuality was hetero-, homo- or bisexual. For the 21st century this isn’t enough anymore and the Royal Ontario Museum distinguishes between:
A third gender
asexual
bisexual
cis
female
gay
gender fluid
gender queer
intersex
lesbian
male
not even close
queer
questioning
straight
trans*
two spirit
uncategorizable