A interrogate (for grown-up general public (lol)) 2...?

Sorry for those who contend otherwise but this is what science defines as an erection ( from http://en.wikipedia.org/wiki/Erection )
"The erection of the penis, clitoris or a nipple is its enlarged and firm state. It depends on a complex interaction of psychological, neural, vascular and endocrine factor. The ability to carry on the erectile state is key to the reproductive system and oodles forms of life could not reproduce within a natural instrument without this cleverness."
If you didn't know this, what did you think an erect nipple or clitoris be called? Nice Question (lol.)
X