Stretching with a semi.

I’ve noticed that when I stretch I tend to get a semi erection sometimes for some odd reason (40-60%), should I try to get rid of it completely before doing it again or is it OK to stretch with a semi?

Because approximately half of the penis is under and behind the pubic bone, and getting erect means it all gets erect, then I’d suspect that it would be more difficult to get a good ligament stretch if the thing the ligs are attached to is trying to be all in a line (inside and out). That’s the long way of saying that flaccid stretches would seem to be easier to perform and more likely to get the desired results than a semi-erect stretch.