One of the biggest problems people have with their harnesses is that they aren't secure and stable, and this makes them feel like they have less control.
However, this quandary is easily solved with a Vac-u-lock® suction cup plug; something as simple as having a solid conjoining piece between the strap-on and harness is one of the best ways to secure the dildo, and besides the benefits of control and leverage this allows, it also adds to the authenticity of your fantasy role playing by making the penis look like it's actually a part of your body.
This Vac-u-lock® is made out of firm rubber and has a flat suction base for extra stability. You won't be able to use this locking system with all of your dildos-only the ones that are Vac-u-lock compatible.
Don't worry, there are countless compatible dildos that are also reasonably priced, so there's really no reason not to take advantage of this locking system; it won't disappoint and it's one of the best ways to enhance harness play.