Man's most magnificently majestic manifestation of masculinity, and the one potentially most exciting to a woman. It looks like a
rocket ready to be launched, and has the same turbulent thrusting
force and energy.
It signals to a woman that a guy is ready and able to have sex with her and eager to do so, which, if she finds him attractive, tends to kindle her interest. For that reason, it is a serious though common mistake for a guy to be embarrassed or self-conscious when he has an
erection.
Freshman year, after pulling an all-nighter, I stripped and got in
bed, only to wake a half hour later with an urgent need to
piss. I got up without waking enough to know I was naked, much less that I had wood, and walked down the hall to the bathroom. Only as I walked past the open
door of another room down the hall and saw a woman grad student staring at me with wide eyes did I look down and see I was sporting the most giant hard-on I'd ever seen in my
life. Afterwards, she kidded a male grad student we were both friends with that I had a
better body than he did. He replied, "You've seen more of it than I have."