2 minute wonder

So sex with my partner for the past 6 months has declined... RAPIDLY!

He's literally only lasting a couple of minutes ( if I'm lucky )

He's said it because we don't have sex often enough ( we do a few times a week ) and I've told him to well " do it himself " more often but it doesn't seem to be helping.

It now just feels little me a chore for me " to keep him happy" as I'm left laying there unsatisfied and a bit let down.

I'm probably sounding selfish right?

He's only 23 & im 28 , I admit my libido these days is pretty low I've had 2 children I work and do ALL of the household chores so I'm exhausted at the end of the day and sex is the last thing on my mind sometimes but I do make the effort to make sure that we do have sex but in my mind I'm like "why bother" I get no pleasure from it these days as I literally don't get the chance to because he finished so quick!

HELP!! What can we do? Is there anything we can try? Has anyone else experienced this?

I used to love having a good romp but now I just can't be bothered with the let down