I used to put the ruler right over the top, horizontal to the penis. Later I learned it was pushing back on the suspensory lig, and pushing the penis back into my body by .1”-.2”. I measure now, just to the right of the suspensory lig. So the ruler will still be horizontal to the penis, shifted so that its edge is just to the right of the suspensory lig.
I believe its a good way to measure. Also those of you on sites where women are looking for lengths, the most common way in the world to measure it is to the side of the penis. Most people have an extra .50” measured this way.
Also on the seated vs. standing measurements. Most of you can get the same measurement seated as standing, by humping your hips forward a little bit. Imagine tucking them under and forward. I believe this is fair, as it does indicate a max penis length and you will achieve it during sex. If you kick your hips back, you can lose from .50” to almost a full 1” if you exaggerate it…
I do my measurements seated, but I do not lean over, I lean forward slightly so that I can get a perfectly perpendicular measurement on the ruler.
And Yes, Mandigo does have his body and hips positioned, so that his unit is at max length at all times. He is hardly at a position where his penis length is not optimized. Its not a bad show for those of you that can do something similar.