Tightening of the ligs is the last thing you want and I doubt seriously that they would tighten at all. What would cause them to tighten?
If that were the case then you would actually be loosing length. The ligs are tied from just under the glans and run all the way back to the pelvis. If they tightened you would become shorter.
Whats actually happening is regardless of the angle your stretching the ligs, tunica, urethra, corpus cavernosa, etc etc will be stretched. Some more then others but in general all will be affected.
Also posted as Dlrowdnilb