Unless your penis is conical, a correctly fitting condom will stay on.
To find the correct size, get an erection, and measure the circumference (i.e wrap something round your penis, about 1/3 of the way up).
Condoms are sold with a stated "Nominal Width" which is the flat size of the condom when opened out. This is HALF the circumference, and generally falls in the range 45-60mm.
Pick a condom width that is closest in size to HALF the circumference of your penis.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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