1- The doggie
2 - The antelope
3. The snake
4.The rabbit ears
5. The V-formation
"While it’s true that society tends to place a great deal of importance on size, the simple truth is that a penis of any size can bring a woman to orgasm, provided the man makes the most of what he has. Yes, that might mean you need to stimulate her clit during intercourse, but that’s often necessary with a large penis as well. Foreplay is what matters most; one good orgasm from a man’s tongue will pretty much win any woman over. Combine that with our small penis sex positions and your woman will be more than satisfied, we promise."
See the entire article along with explanations @ AskMen