No doubt, but to define something as cognitive and circumstantial as motivations for lying? I mean these are the highest order cerebral processes not what urges you have. I think the higher the cerebral functions involved the more cognitive you get, the less innate you get. The more you flesh out your desires and urges with specifics, the more learned it is. There's stuff I've read in this library that turns me on a lot that I'd never thought of before; equally the specifics of my desires have changed the more I've known. As for coping with social relationships you only have a repertoire of learned responses, you may fancy someone innately but you use learned behaviours to actually approach them and tell them so. Equally you manage that relationship in the same way. My opinion.

I think that your town does not constitute an equal social playing field. Just because 8 people are in geographical proximity does not make their experiences the same by a long way. That's not to say that there are not genetic componenets which I'm sure there are, just that it's not possible to control for environmental factors even with non-identical twins.