Paper about 2D:4D finger-length ratio

PAPER: "Short- and Long-Term Relationship Orientation and 2D:4D finger-length ratio."

Study 1 explored the relationships between 2D:4D finger length ratio and Relationship Orientation (Short- and Long-Term Relationship Orientation) in a sample of men. 

Study 2 extended Study 1, examining both sexes and further variables which might influence Short- and Long-Term Relationship Orientation. Earlier studies found different correlations between 2D:4D and the construct of interest, depending on the hand (left or right) and sex of the participants. Therefore, we report our correlations between 2D:4D and Short- and Long-Term Relationship Orientation for both hands separately.

(mistakes at Fig 1. and Fig 2., the right part of figures relates to left hand)

That paper does not assess personality of participants and does not take into account actual facts like:
* contraceptive pills / contraceptive hormonal treatments
* women who work and earn more money than men.

That paper also does not cite fresh, new & important studies showing contraceptive pills users make different mate choices, on average, compared to non-users.

1) "Human oestrus" Gangestad & Thornhill (2008)
"Only short-term but not long-term partner preferences tend to vary with the menstrual cycle"

2) "Does the contraceptive pill alter mate choice in humans?" Alvergne & Lummaa (2009)
".. whereas normally cycling women express a preference for MHC (Major Histocompatibility Complex) dissimilarity in mates, pill users prefer odours of MHC-SIMILAR men, indicating that pill use might eliminate adaptive preferences for genetic dissimilarity."

3) "Personality and reproductive success in a high-fertility human population"  Alvergne, Jokelac & Lummaaa (2010)
The reproductive success of both men and women is influenced by our personality traits, according to the paper.
The study, found that women with higher levels of neuroticism and more extravert men, are likely to give birth to a larger number of children in societies with traditionally high birth rates.



Latest Research in Theories of Romantic Relationships Development shows: compatibility is all about a high level on personality* similarity* between prospective mates for long term mating with commitment.
*personality measured with a normative test.
*similarity: there are different ways to calculate similarity, it depends on how mathematically is defined.