We once tried the Fun Factory Share (like the Duo) but it didn't work out too well. These products try to be all things to all people and generally fail for at least one, if not both of the partners.

Specifically, the 'pony' that the woman tries to hold in vaginally - requires a lot of muscle control that detracts from the overall experience - popping out at all the wrong times. As for the receiver, it's a geometry problem. Taking into account the locations of all the key anatomical openings - the shaft just isn't long enough - again popping out at all the wrong times.

I get it - leather harnesses are intimidating for beginners. So after the Share failure we tried a panty harness from RodeoH. This was definitely a step in the right direction - but it was pretty limited in the size of dildo that it could handle - not much bigger than 1.5" diameter.

The next step was a Velvet Nest cloth harness with a Velcro closure that accommodates large dildos - great product - but a bit expensive.

After all this trial and error I finally found a leather harness that was comfortable for my wife and effective for me. Caution - not all leather harnesses are created equal - buyer beware.

To solve the problem of vibrations wanted/needed by my partner. We take a multi step approach.

1. We have a vibrating cock-ring to put on a dildo that I insert vaginally for her before donning the harness. The straps of the harness do a reasonable job of holding the dildo in place for her
2. We have a vibrating butt plug for her that is both strong and stays in place.

After a bit of trial and error, my wife can now reliably orgasm while pegging me - so great fun is had by all!