Came up with this by accident. It is not tested and should be used with caution.
Lay down and bring knees towards chest. Reach around outside of leg and under leg and grab penis. Lower feet to floor still keeping knees bent. Pressure can be applied by moving upper leg out or sliding feet further down.
Can be used as an intense stretch or a lighter stretch. I have done these with light pressure for around 30 minutes or more switching hands every few minutes. It is very easy to maintain grip and very easy to apply extreme pressure so PLEASE BE CAREFUL!
If you prefer a more straight down stretch this can be done the same way only lift up your but cheek to allow your hand to pull straight down.
If anyone decides to try these, let me know what you think. I have been doing them for a couple of weeks and like them but it is to early to tell if they are doing any good.