The body learns the grip it is given
The most common finding in men who cannot finish with a partner.
Clinicians who treat delayed ejaculation report the same pattern over and over: a masturbation style faster, firmer or more specific than anything a partner can reproduce. The term in the literature is idiosyncratic masturbation, and it is described as the single most common factor in men who present with the problem.
The mechanism is unremarkable. A body given one narrow kind of stimulus for years responds to that stimulus and less to anything else. The treatment is equally unremarkable: vary the grip, the speed and the position on purpose, and the range comes back for most men who do it.
What to do with it
If finishing with a partner has become hard, the fix is boring and it works: for a month, change one variable at a time. A looser grip, a slower pace, a different position, less pressure, and no single stimulus used every time.
A sleeve helps here only if it is used as variation rather than as a new fixed habit. Loosen the suction cap, pick a gentler texture, and stop treating the most intense product on the shelf as the best one.
The type is covered from the other end in the guide's page on strokers and what separates them.
