My tips for lasting longer.
When I feel I'm about to cum (and if it's not right at the end of the session) then I'll squeeze my cock between finger and thumb, just under the helmet. It doesn't always work but usually this helps me lose the desire to cum and I can carry on fucking afterwards. The trouble is that if I'm fucking a really hot girl I have to remember to apply this technique earlier as if I wait until just before I'm about to cum to do it, the sight of me pulling out of the tight pussy of a really sexy girl can just tip me over the edge - and no amount of cock-squeezing can stop me emptying my load.
Also, really thick condoms make me (and probably every other man) last longer. You know the "pond liners" that some WGs use - so thick that you can't really feel much when fucking. Any girl that provides this kind is just making extra work for themselves as her clients will last a lot longer so she'll spend a lot more time fucking rather than timewasting.
I pick sexual positions where I'm in control of the speed and I'll slow down to a snail's pace if I feel I'm getting close to orgasm, usually thinking about something else for a half a minute or so (what I'm having to eat afterwards usually does the trick). Even in doggy you can be in total control of the speed. Many WGs will offer this position to try to make you cum quicker as they can ram their arse against you. However, if you pull her very close so that you're very deep, then you can be in total control of whether or not your cock slides in and out (generally the movement which makes one shoot). I hardly ever let a girl ride on top of me where she is the one controlling the speed, that is unless it's either at the beginning of the session when I'm warming up, or it's near the end and I intend to finish that way.
Finally, simply changing positions regularly or switching between sex and oral (I know many WGs would complain about the latter as they might want to change condoms but ask anyway), so that the sensations are different, helps me hold off for longer.
As a one-cum punter I have to employ all these little tricks to get the most out of my session. The only time I've ever cum more than once in a single booking (and only in one hour bookings) is when the first pop has been unexpected and I've tried to stop it, resulting in an unsatisfactory orgasm where hardly any jizz comes out. After one of those then I can usually get hard again pretty quickly and cum again fairly quickly.