I only found out a couple of months ago that men have muscles at the base of the penis.
I thought all they did was go erect and then flaccid again. Frankly, I'm jealous. My clitoris can't do that.

They also didn't tell us that the clitoris has deep roots and its total size more or less equals that of the penis. I thought it was just a little nub.
( Bob Todd whee, Mon 30 Jul 2007, 10:27, archived)

urf
I didn't know about the clit roots thing. I'm glad girls don't get boners. We can have the horn without anyone noticing.
( spangolin - the odds are good but the goods are odd, Mon 30 Jul 2007, 10:30, archived)

I only knew that because of the book about lesbian sex
that got newslettered a while back. It had the look inside feature and so I had a little read. I also didn't know that the vagina collapses closed when it doesn't have a cock/dildo/baby/aubergine in it. It seems obvious now that I know, but every diagram I've seen shows it as an open tube.
( Bob Todd whee, Mon 30 Jul 2007, 10:34, archived)

You can test the roots thing
by pressing the sides of your flange down from your clit. It's all connected.
( DeSpong currently knitting your suggestions - see profile, Mon 30 Jul 2007, 10:36, archived)