I know i am not an expert of this..
Its complicated how humans choose a marriage partner. I think as primates we are inclined (the universe shapes your choices-vague) to choose a partner with whom we can produce a future generation which is going to survive better. Now its a bit complicated in that how do we qualify something as a quality for better survival ? We can say cognitive ability, beauty, athletic properties etc, the pool is quite large. (and i think a proper study on this has too much statistics, tedious and non-conclusive. Interestingly one can find a partner with a sharper mind, but i have seen both parents being sharp but the kids dumb one time too many. Which causes me to think the parents chose each other not because of physical attraction (which nature encourages-survival of the fittest remember ?) but because of other virtues they saw in that partner be it financial position et al.
The way i am naturally interested in the opposite sex is not the way my young brother is, which is not the way my dad is. I think nature has intrinsically coded survival of the fittest instincts in the way we get attracted naturally. (hence we can see poor parents who f*ked each other senseless coz they were attracted to each other when they met at a party, producing bright kids - well its not conclusive but i've seen this one time too many)
So what am i saying umm ehhh i don't know
