Quite by accident while sitting in a reclined position enjoying my Venus I leaned forward to reach something to find the receiver rolling over the top of my balls. Felt really good, but I believe a ‘on slow’ only use. I have since started sitting on a pillow the narrow way, lifting my balls up enough for the receiver to roll over the top of them. Some lub on them helps. Another added pleasure the Venus can give.
What you could probably do is make a strap out of a stretchy cloth, like maybe pantyhose, that attaches to the open end of the receiver and hangs down below the opening. Just hook the strap under your balls and let the receiver pull them up and down with the stroke, if you get what I’m saying.
I imagine you’d probably want to keep the stroke a little shorter for that.