To be honest considering what he has to go through on Torchwood - living forever,all the endless, often painful and violent deaths, being buried alive for thousands of years,poor leadership decisions/ endless family drama leading to the rapid demise of his team mates, having to sacrifice various relatives for the greater good etc. - it's probably just as well for him that apparently all it takes is a good shag to make all right with his world again. If the poor guy had to also deal with the real after effects that go with any one of these events he'd be a serious wreck by now.