@ abitwobblynow
can I have the million pounds? The reason that people have affairs is all to do with "the sexy son theory" and the reason they do not want to leave is covered by this too.
It is basically to do with the fact that humans are not a monogamous species, but not everyone can have the best males to mate with. The science comes from observing birds, but it relates to humans as well.
male bird with best song/nest gets first available female, and second and maybe even third. But female No 4 comes along and she has got a dilemma. Does she go for forth wife for best male or first wife of second best male?
So basically you mate/marry the best male that you can get. But if you have a chance of a shag of a better male, who can give you healthier offspring, you do it on the sly. Its all about trying to give your offspring the best genetic mix you can so that they will survive in Darwinian terms. The did genetic testing of the birds and found that most offspring were from the alpha male.
And this is what humans are genetically programmed to do as well. Only we are stupid and don't realise what we are doing, and confuse genetics for love lust and other stupid things.
I'll pm you my bank code LOL