it's in the genes, really everything is

Want a longer life? There's a gene for that.
"Mutations have been found to extend the lifespan of animals in the lab such as worms, fruit flies and mice, and appear to play the same role in humans. Professor Linda Partridge, director of the Institute of Healthy Ageing at University College London, said such research could help treat or delay many diseases simultaneously with medication."- telegraph

How about the love of your life? There's a gene for that.
"When it comes to choosing a mate, opposites really do attract, according to a Brazilian study that found people are subconsciously more likely to choose a partner whose genetic make-up is different to their own."-reuters

Want to get wasted? There's a gene for that.
"Researchers found that those who had the genetic make up were able to become hardened to the affects of alcohol and therefore able to drink more.Those without it would not be able to consume as much before becoming drunk or falling asleep."-telegraph