Toys and fingers always work a treat...
I love to give self enemas...cleans the chute
Cumming on my face and in my mouth is also an occasional fun activity...on your back - stocking clad legs high in the air
But my favorite masturbation activity is when my wife gives me a handjob/blow-job using a silky pair of her panties wrapped around my cock...mmmmm! Then we lick all of the cum off together...