I don't know how I missed this thread for so long.
I'd say I have two really major fantasies. One, I'd really like to try some bondage type activity beyond just spanking. Being tied down so I couldn't move at all and being completely dominated over in a rough way. Not so far as to cause any real permanent kind of pain, but a few resulting bruises wouldn't be so bad!

Also, I really want to experience being fucked by another woman with a strap on, that's very high on the list.
And then one minor one I have would be to see what it was like to kiss or have oral sex with someone who had a tongue piercing.