This is another interesting article. What is also interesting is that this article says that valve incompetency can be induced?
Its also interesting to note that even with similar issues, some end up with MS and some with TGA.
Of this group, more than half (52%) stated that they had sustained an activity that could be associated with a Valsalva maneuver, including sexual intercourse
Lot of questions unanswered but I hope Dr. Z's work will open flood gates in new research direction ...
A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die and a new generation grows up that is familiar with it
- Max Planck