So please, stop using your fingers as temporary dick surrogates and try an in- and-out motion: The young man inserts his penis into the young.
or “urethral meatus”) is just way too small to insert a finger or a penis into it. but I've seen at least index and middle finger (together) insertions on a male.
Both are a form of 'finger-fucking' the urethra.” with your partner if you decide to engage in urethral play together. Also, inserting a penis plug or urethral sound into a flaccid penis is easier, because there's less resistance.