What dildo is best for causing an anal orgasm without manual stimulation?

Insightful breakdown of Pegging:

New to the strap-on world...
My boyfriend and I are interested pegging. I picked up a few dildos - the small silk and Vixen's Smooth Operator Kit (with vibrator) dildo. My...

What is pegging?
Can some on please explain to me what pegging is??

Pegging Ladies -- Do you get turned on watching your man's butt when you're doing this?
Whenever I'm doing BB with my strap-on, I get all hot seeing his ass being plowed. My nipples get hard and my pussy just drips and throbs while I'm..

Good Harness For DP
So I'm a guy looking for a harness that will work well for me to wear for DP but will also work well for my wife during pegging using a Nexus Maximus.

Whats a good way to get my SO into pegging?
Its something I would like to try but im not sure if she would be into it. Any tips on how to bring it up?