BRANDON, Fla. – Alex Aggar and Bobby Malone have always been told they looked alike.
The two have been friends since childhood, playing on the same baseball teams, graduating from the same Tampa high school, and now playing baseball together in college.
Each with a secret of sorts.
Alex knew he was adopted; Bobby knew he had a brother out there that his mother had given up for adoption.
One day after baseball practice, the two got to talking, and started comparing notes. From there, the coincidences started piling up.
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Harlow's Monkey 
on a related note, there is the phenomenon called genetic sexual attraction. here is an article from a few years ago in the guardian (uk press).
http://www.guardian.co.uk/weekend/story/0,3605,956454,00.html
Interesting. I am actually the aunt of our newly found nephew. It is exciting to have finally find him!!