Relationships of Sportstars- Real or Surreal?

In the USA there have been a slew of reports on athletes and their adulterous lifestyles. Married NFL player Steve McNair was killed by his girlfriend. In Australia, NRL star Greg Inglis faces charges of assaulting his girlfriend.
These stories, and more, are not uncommon in the non-sporting world, so is it because of their media profile that it seems to be more of a problem within sport?
A recent article reported the divorce rate for NFL stars was 60-80%, much greater than the national average. Why is this?
Life and a relationship while playing sport may be very different when the sporting career is over.
In a piece on Deadspin, it introduces the problem that it's not only the athletes that need to adjust to a new life on retirement from sport. Their spouses are also experiencing change and coping with not only a change of lifestyle but also the change in personality the former athlete may demonstrate. The dynamics of the relationship can change and it may not be one either party had expected or want.
Even during sport their are challenges for relationships due to long absences and temptations. There is a long-accepted creed "What goes on tour, stays on tour" which goes to suggest that extra-marital relationships are condoned, perhaps even by the spouse. Simone, wife of Australian cricketer Shane Warne, regularly forgave him for his indscretions.
These acts may be less excusable when the athlete is retired, but are they still tempted towards old habits? How does a relationship survive sport?
I believe solid relationships are built on shared values, clear communication, mutual respect and a desire to grow together. A greater understanding of values and how they affect both the individual and the relationship can help.
What do you think?