Heh. I'm not surprised, having gone on to some websites with detailed anatomy. The clitoris has these big wing-like projections that run back that way, and so maybe those are the thicker or thinner tissues that they're talking about?

I used to worry about not having vaginal orgasms, even knowing that a huge percentage of the population doesn't. Now I just enjoy the sex and try to be sure to have frequent orgasms, and it's a much happier place to be *g*.