Thank you Discovery Channel
If a human's penis were the same bodily proportion as a gorilla's, it would only be 2/3 of an inch long.
When humans evolved into an upright stance and the vagina moved to a forward/downward orientation instead of rear-facing, the lips evolved/adapted to take over the advertisement/attraction function that the engorged vagina used to have.
A limp penis is actually in a tightened, tense state. To enable an erection, the muscle tissue relaxes its grip and nitric oxide (not to be confused with nitrous oxide) causes blood artery walls to relax, allowing then to fill with blood.
Also, the sight of a CG baby being birthed from a CG skeleton is near faint-inducing. That sucker's huge! I'm sure glad I have the penis.
When humans evolved into an upright stance and the vagina moved to a forward/downward orientation instead of rear-facing, the lips evolved/adapted to take over the advertisement/attraction function that the engorged vagina used to have.
A limp penis is actually in a tightened, tense state. To enable an erection, the muscle tissue relaxes its grip and nitric oxide (not to be confused with nitrous oxide) causes blood artery walls to relax, allowing then to fill with blood.
Also, the sight of a CG baby being birthed from a CG skeleton is near faint-inducing. That sucker's huge! I'm sure glad I have the penis.