group of men who had been studied by researchers for 45 years, they're 90 years old and they have eaten the mediterranean diet the whole time and 70% of them report having regular sex. we don't know if the sex made them live long or they lived long to have sex. we do know regular sex is associated with lower rates of depression. higher rates of sociability. higher rates of intimacy. we are here for one purpose. that is to procreate. it only makes sense that the more we do it the more we'll be favored by evolution. >> darwin said once you procreate your darwinian has expired. so you don't need to live that long. i won't let you respond to that one. >> you know where i'll go. good to see you, sanjay. >> thank you. dan buettner. next on 360, face to face. george w. bush, dick cheney meet for the first time since leaving office. we have all the details coming up. 000 miles.