I mean, I've tried. I've got various toys (rabbit, octopus, ordinary willy shaped).
But it does always seem like a false, odd thing to do. I've tried after a drink, stone cold sober, with music, with candles, after a bath, during a bath .......
Admittedly I haven't for a while, just didn't see the point. But I have heard that some people find it helps with stress, relaxation, better sleep.
So come on, I'm eager to learn .....
(I might have to change my name after this ....)