Here's a fun one. The "Plushies" are a group of animation fans and furry fans who've taken their fantasies into the real world, thanks to those big cuddly stuffed animals we've had all our lives. The plushies found a home on alt.sex.plushies, and wouldn't you know it - there are lots of plushies coming out of the closet! It's an underground movement in progress...and it's a lot more interesting and fun than blow-up sex dolls. A plushie mailing list also exists, though it's generally tamer and the sex talk is kept to a minimum.
However, there are some extreme plushies out, there. HOLYFUCK is a photographic example of that extremism. Warning: very graphic.