Our first harness was a Vac-U-Lock one (an Ultra Harness with the extra hole for a guy). We found that the hole was positioned wrong for trying DP and really just gave a place for hubby's cock to stick out from while he was using the dildo on me. We never had any success with it at, and the included butt plug was HUGE and never got any use at all. To be honest, we've had much better results with RodeoHs and wound up buying two pairs, one for me to use on him and one for him to use on me. We've recently bought a Spare Parts Joque harness and while that's not the male one, we'll probably try it out that way at some point just to see if it works or not.