Have I? No.
No one has. They have studies showing that it's likely passed from mother to son, with a specific portion of the X chromosome being the likely carrier. There are also familial and brother studies in addition to the twin studies.
The fact that plenty of animal species show the behavior as well leans toward a genetic explanation. With all the asshole bigots like you in the world, I can hardly see why someone would "become" gay intentionally.
Regards,
-scott anderson
"Welcome to Rivendell, Mr. Anderson..."