we had this problem. I gave him the laundry ALL of it for sat morning (he already had the yard work which he does enjoy too) and I do the rest which is okay with me b/c I do it my way.
sure, now he thinks he's the best husband ever, but i deal with that annoyance since he does actually do that task now and I am free of a large thing. find one other thing non negotiable, like he has to put his dishes in the dishwasher when done. men are not good at multi-tasking or being told what to do, but if you set one expectation or task, they can be trained to do and follow it. it's the only thing that works for us.
tell him you just can't keep up anymore and NEED his help. his other option is to help pay for a maid, outsourcing etc.
also, I'm just being honest here, there was a sex component. if he's getting a little more, he's happier to "help" out and less tired etc... works for me and I find less stress for me makes me enjoy the saturday morning laundry sex as well