What is the science behind sexual attraction?

Question

The underlying science behind it, what is it?

Answer 1

Here's what I know (and it's not much), when you are attracted to someone it has to do with their pheremones (smell) and usually, you're not attracted to a gene type that is too similar to your own.  Also, when you are in the first six months of a relationship you brain chemistry actually changes in signficant ways, giving you that new relationship high that fades with time.  Good luck!