here's my list so far...i've started writing them down in a word document just to keep track of them.
biting
rain/thunder and lightning
water (see my previous post about it)
knife play
fire play
food play
rope bondage (i love the way neat ties and watching someone struggle in my ties looks.)
cum restriction/game
foreplay (lots and lots of it, I want her begging for it)
public
floggers
spanking (bare hands)
hair pulling
asphyxia (...at least threatening it)
control and mind games (my favorite second to ropes)
corsets and sexy lingerie (on women, not on me :P)
clothing (I've always loved having sex with a girl who's partially or as fully dressed as possible)
collars
pressure points (the good ones)
gagging a girl on me
pinning a girl down or restraining her with my bare hands
handcuffs
rough sex
skin on skin contact