I voted that it's "part of my job description" as that was kind of the closest to our arrangement I can come. It's not my "job" because I'm the SAHP, but it's how we worked out chores--he does dishes, I do laundry. etc. There's not separate "his" and "hers" loads or anything. I do our son's laundry separate from the "grownup" laundry simply because we like fabric softener and dryer sheets whereas I don't want to include those in our toddler's laundry, and because smaller clothes would get lost in the shuffle with the larger loads, and because his laundry needs done on a different schedule depending on how many diaper blowouts he's had or, conversely, how many days I've gotten lazy and left him in the same onesie if it's not dirty and we've not been going anywhere.
I hate folding laundry, so often it doesn't get folded or my husband helps with it.
I typically do a load a day or every other day of our clothes--Monday/Tuesday is whites/lights, Wednesday is darks, Thursday/Friday whites/lights, Saturday darks. Diapers and baby clothes whenever they need doing.
...and if my husband needs a special load done, like say he wants a certain shirt clean for work or he's been going through socks like they're going out of style, he does it.