Cowgirl. Great access to the mammaries for us taller guys. My girl needs a lot of nipple work to climax, and I simply can't give them the attention they deserve in missionary.
I have trouble with some of the rear-entry positions (doggie, spoon, etc) because the sensation feels so different. It puts more pressure on the underside of the shaft and stimulates the frenulum, which sometimes... ahem... "limits my endurance." :redface: