I've been practicing this kind of satisfaction for years. is also very farable to use . in the car -cock in bottle press air out cock gets stiff. and then and so on.
I did this when I was in my late teens, its very fun, sometimes my cock stucked in the bottle becaus3 of the vacuum, this was the time I accidentally invented pumping.
I've used mine several times. If you get your dick in just right where the suction vibrates it against the tube its very satisfying. I've had some really great orgasms that way.