I agree with the tendons just being tight.
I remember the first time a girl rode on top and leaned back, it wasn't so painful that we had to stop but I remember being relieved when she sat back up.
If you don't have a S.O. to help you with it, just work with it when you're doing "the business". Try pushing it forward as far as you can w/o being painful. As time goes by it'll move more.
It also sounds like you're inquiring about the flexibility of the shaft itself when you're aroused.. It's supposed to be hard and not like flexible foam.
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"The truth is merely an excuse for lack of imagination." - Garak
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