A while ago I was watching House on TV. An Interesting scenario was played out over the hour.  A young couple got sick.  They were admitted to the hospital in intensive care and both are in critical condition, dying. They have to find out what is wrong with them.  As the episode unfolds you find out this couple is total devoted to one another.  They have known each other since they were young kids, and found this wonderful connection; they had been best friends and lovers for years now they are in the middle twenties.
House and his crew did blood test up to the waa-zoo on this couple.
They found out that the couple was related; they were half brother and sister.  Apparently the boyfriend’s father had an affair with the girlfriend’s mother. The mother got pregnant and had a baby girl, which was the girl friend.
Both were miraculously cured and were ready for discharged.  The information was disclosed to the couple about being related. The girl friend became repulsed by this information and broke up with the boyfriend and split town.  The boyfriend was devastated that he lost the love of his life.
I have been thinking about this for a while.  We live in times where sperm banks & egg donations are very, very popular.  This increases the chances of the future generations propagating with their half brother or sisters.
It is so hard to find someone that you can connect with and love.  How would you react if you found out that you and your partner were half siblings?