I am sure this works well with woman as well but for me this is lots of fun even at my age.
I sit on the bidet facing the faucets with my cock just above the water fountain.
I adjust the temperature to an agreeable warmth and send it up onto the tip of my limp cock. At my age this usually takes some time. Little by little I get hard and the head of my cock starts to come out of the foreskin. You can hurry the process some by skinning back your foreskin. Anyway, as my cock gets harder and harder it uncovers and the jet of water hits directly on the frenulum and that gets me even harder. Once I am good and hard I move forward a bit to have the jet spray up on my balls or between them and asshole as I now use my hand to masturbate feeling the caress of the warm water...what great orgasm!
Note: A younger man should be able to get off without manually masturbating... the water jets should be enough.