Or perhaps doing the splits?
Yes, google is your friend.
Yes because big ass bodybuilders are known for their profound and impressive flexibility and gymnastic feats.
Some are, in fact, amazingly flexible and agile.
Yes the bigger you are the more inflexible you get.
Complete bullshit unless you neglect stretching.
Muscle mass can reduce flexibility slightly, but not to the extend you claim.
If you can't tie your shoelaces, it's probably because your gut is in the fucking way.