Their bodies and brains are going to continue to adapt to an ever-changing world. Yours won't. Will your digestive system be able to handle the same food they eat? Will your brain enjoy the same entertainment? Will your non-evolved tongue even be able to speak the languages they speak in the year one million AD? Would an unfrozen caveman be able to do all of that now?
One thing we do know: You won't be getting any lovin'. It turns out that mother nature hates inter-species breeding, and is such a big cockblocker that science had to come up with a name to describe it: Reproductive Isolation. It's the reason there aren't packs of ligers or centaurs roaming around.