I don't actually 'point' it downwards. It just hangs there [to the left]. I guess it depends how tight your shorts are.
If I wear tight briefs then, yeah, I position it pointing sideways left. But I don't like tight briefs and prefer
looser shorts. I like my li'l bro to hang free, without being constrained.
When erect, the penis needs a slight upward curve to follow the natural thrusting action from the hips, which is
forward and up into her pussy. It must be very uncomfortable if the dick is curved downwards.