All new and fresh research are using the HEXACO (aka Big Six test) but as Online Dating sites have very big databases, in the range of 20,000,000 (twenty million) profiles, the BIG Five model or the HEXACO model are not enough for predictive purposes. That is why I suggest the 16PF5 test.
ALL Online Dating Sites using the Big Five normative test are OBSOLETE now!
The BIG5 normative personality test is the biggest mistake
Psychologists made since several years ago. The BIG5 is also known as
the Five Factor Model theory of personality traits, a psychological
model based on research by Paul Costa and Robert McCrae.
BIG5 normative personality test is OBSOLETE
"While the Big-Five has been the dominant
approach in personality research for over two decades, recent
investigations have identified a sixth independent personality dimension
referred to as Honesty-Humility (Ashton & Lee, 2007,
2009). The six independent factors then are: Honesty-Humility (H),
Emotionality (E), Extraversion (X), Agreeableness (A), Conscientiousness
(C), and Openness to Experience (O). This six dimension model, referred
to as the HEXACO model,
is argued to account for cross-cultural lexical findings, as well the
subtle distinctions between personality traits better than the Big-Five
(Ashton & Lee, 2007). The original measurement scale of this model
consists of the 60-item HEXACO-60 scale (Ashton & Lee, 2009)."