I cannot judge if it's biased (in the way meant in this thread), but there is a rather weird statement right in the first section, "Factors that affect decisions":

> In psychology, the parental investment theory suggests that basic differences between males and females in parental investment have great adaptive significance and lead to gender differences in mating propensities and preferences.[10]

First, the reference is to a text book. That's not good. Second, the theory is not not widely accepted, and did receive criticism. It's certainly not an established fact. Third, the statement's prominent place, and lack of further qualification, suggests that human parents should take care of the amount care men and women invest in parenting, but that's not at all what the theory is about. The article linked explains that very clearly.

Why it was placed there is a mystery, but it's not been a neutral, well-informed edit.

> Second, the theory is not not widely accepted, and did receive criticism.

Then contribute a link to that criticism? AFAIK that's the normal policy on widely criticized statements that are still popular enough that they should be mentioned.