I'm really not the one to talk about joint problems, since mine are pretty solid and never gave me any problems lifting heavy (my favorite rep range is 1-3, lol).
You shouldn't have any sexual side effects on cycle if you're running at least a trt level dose of test and not using huge doses of aromatase inhibitors and knocking down your e2 too low. An exception to this is, for some people, deca which can sometimes cause 'deca dick'. So if you want to try deca, I'd suggest replacing it with NPP, same hormone (nandrolone), but npp has a lower half live, so if any problems do occur you can stop it and it'll be gone quite quickly. Immediately after the cycle you may have less libido and a harder time achieving erections, but this should pass in a few weeks. Personally this doesn't happen to me. The chemical imbalances should correct themselves, pct helps speed it up, but there is a tiny percentage of people who can have lasting effects (very rare). Acne... well I do get some on my chest while on and they go away after the cycle. Some people do get more, but they should disappear once your natural hormonal system starts working.
Is it addictive.... well let me put it like this. It's not addictive in the way drugs are as in you'd just crave more. However few people do just one cycle, because once you've trained on cycle training of cycle becomes kinda boring (you can't lift as much nor as long, pumps aren't as strong, ...).