Similar gender differences in sexual interest are observed cross-culturally. This observation supports a(n) perspective on the origin of these differences and suggests that they largely reflect .

evolutionary: nature    

Explanation:

The evolutionary perspective is described as a perspective which is related to individual difference and personality of a person. It explains that individual differences and an individual's personality have been evolved in various parts in order to provide or deliver a few specific for of 'adaptive advantages' associated with the context of reproduction and survival.

However, the evolutionary perspective does affect nature as it involves the evolution of different aspect or survival and reproduction.

the two sets of lines are :

if you are on the computer you can not take a picture but you can upload one but i am not sure about phones but i'm pretty sure it's the but to upload one just click the paper clip looking thing/ link thingy thing and upload a pic