On topic - how to keep going longer?
How about stick your thumb over the tip? Might give you a headache though.
Ok for a 5 knuckle shuffle, bit difficult if you're banging a woman, unless her name is Slack Sally.

And please dont tell me to go marry myself, I cant do that cuz I'm a Catholic and if I did Mother Mary would turn her head away and weep.

(and oh yeah, about 20 years ago a ahem 'friend' had some chemical you could sniff out of a bottle - no not glue, he got it from a doctor - and you could buy it in certain shops up til a few years ago under the counter, like - its illegal cant remember what it was called, smelled a bit like pear drops).

Ah yes choochi0 you jogged my memory. It was called Amyl Nitrite, or nitrate cant remember which.

Dunno much about it, but like I said about 25 years ago - yikes did I say 20 years ago? My son is 20, so it must be more like 25 - that amyl nitrite was apparently popular for keeping the boys going a bit longer.
If it sounds too dodgy for you, try the thumb on tip trick.

Freemannow: Excuse me, can you help, I'm looking for something to help me last longer during love.

Chemist: Have you tried Boots?

Freemannow: Yes, but I still cant last longer than 5 seconds and it dribbles out the lace holes.

why do u wana delay orgasm..just cum again!!

Do you practice what you preech ??

Masturbate furiously beforehand

Just joshing!

If you think you are gonna cum just use it as an excuse to stop a couple of seconds to change position. If that fails or is not an option think of something uninspirational and unmoving... like the royal family