In the nearly eight hundred years since intrepid settlers colonised Rio, the planet you now live on, there has been almost no interbreeding with humans from the Sol system - the prohibitive 35-year trip to Epseri being out of question for all but the most dedicated. As a member of the forty-sixth generation since The Founding, you are well aware of the differences the 1.4G high insolation environment and the low bio-diversity on Rio have had on your race. At 5′4″ you are quite tall for a male, with thick brown skin and almost no body hair consider yourself quite attractive.
But you know you are different.
Communications and transmissions from people on Earth and Mars show that over there, widespread interbreeding among races has normalised most people to a fair tanned complexion, and at six foot tall the average man from earth is quite the giant. The slender bodies of earthly women just don't attract you much.
Becoming sexually receptive at thirteen, the women of your culture are encouraged to foster large families through several partners - a holdover of earlier times when the population here was measured in just the tens or hundreds. With an average gap between generations of approximately 19 years, and a high abortion rate for medically 'anomalous' youngsters, there is a trend towards more stout, strong and robust children.
This is being recognised by the scientific community and watched with interest by those on Earth.
You somewhat feel part of an experiment, but you enjoy your life, try to provide the best you can for your wives and children, and ponder what the future may hold for your descendants…