When I first started seeing T1, I was given some homework a couple times related to trying to overcome a particular OCD issue (fear of germs/contamination). One part involved rating all the related fears. And then I had to write a story that included some of the biggest fears. We were supposed to record it, so I could listen to it in an attempt to desensitize myself (part of exposure and response therapy, I think), but something else came up, and we never finished it.

Marriage counselor has given us very occasional homework, but one assignment was to "have a fight," just so we could see that arguing was OK and we could come together in the end. Another time, he told us to go do this adventure course thing and zipline to help us trust each other and bring us closer together. Yeah, that didn't go so well, as it just brought up other fears/phobias. I eventually got through the whole course, but spent some time sobbing in fear when expected to walk across a log that was high up in the air. Never did the zipline part because I was so freaked out after the other stuff. Not sure it necessarily achieved its goal...