I didn't last long this time?

As far as I know, there's nothing out of the ordinary about that. I'm a girl and my boyfriend is really good at lasting for a long time (he once lasted for about 45 min) but every now and then there will just be that odd one where he won't last very long. and I'm sure that's completely normal. and depending on your circumstances, it can be explainable. if you haven't ejaculated for a while then you won't last as long, also if you're more turned on, having better sex, more relaxed or not concentrating as much to hold it back. But it could just be one of those times when your penis just does it's own thing and doesn't listen to you. you won't always last your longest but if you really concentrate and have sex a lot (and doing kegal exercises helps too) then you can make yourself last longer and longer. but there still might always be that one time where despite your hard work at it and how well you do normally, you just don't last as long as normal. And don't be too disappointed in yourself. And if you're feeling bad cuz maybe the girl didn't finish, then give her a bit of head, and see if maybe your dick's up for another round.

It may have been because you and her hadn't had sex in a few days or a week or so. If not, that still happens. Sometimes my boyfriend lasts thirty minutes to an hour, and other times, it's like five minutes. It just depends. It may also have to do with how wet she is, and how turned on you are, and all that stuff. Most of the time if we have ten minutes of foreplay, it lasts longer than if we get right into it.

You can make it last longer by not rushing toward orgasm. You enjoy the moments leading up to orgasm. If you find yourself, or your partner coming close, slow down. Else you want to reach orgasm multiple times without losing your stamina and without slowing down, then have a look at http://ejaculationguru.drhealthexpert.com/

Lets talk about my case. I was reaching my orgasm pretty fast, then my partner introduced this pretty little guide which taught me everything I should practise to last longer on bed.

If I can do it, so can you.. Now we indulge in sex almost every night and I last long enough to satisfy myself as well as my partner.

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Keggel exercises

there are a lot of sites on the internet to help you with this. search for "premature ejaculation"