first question: do us humans have to worm ourselves every month like our pet dogs and cats?
Definitely not. It's not even a good idea to worm cats and dogs every month--just worm them when they have worms, which is most likely not that often. Worms aren't an automatic part of our intestines, they're parasites that are picked up from other places. So, it makes sense that you don't need to de-worm if you don't have them in the first place, yes?
NB: if you think you have worms, get thee to a doctor!
As for the smells... well, it's your anus, and it's not going to smell like a rose garden. If the odor is very strong and very noticeable, then perhaps you should see a doctor. It also might have something to do with your diet--do you consume lots of meat and dairy?
However, my general guess would be that your genitals smell pretty much like everyone else's. Genitals have odors, it's natural, and they're really just not something to worry about. If your smells are going to cause a potential partner to turn their nose up (so to speak) then do you really want to be having sex with that person anyway?
what does everyone else do?
I wash my genitals normally with water (and sometimes a bit of soap) in the shower, and wipe when i use the bathroom, and otherwise don't worry with it.
...you mean the files are in the computer?!?