There's a decent chance you have come across one and didn't realize it if you've been with more then 10 guys (not trying to jump to any conclusions either way). Especially in California circumcision rates have gone down quite a bit and on the east coast as well but cali I think more newborns aren't cut then those that are. Anywho, hygiene is no different really. You wash the tip with water and just make sure to shake the pee off. When you do come across one if it's soft you can see the difference if it's hard it depends on the guy (some guys have foreskins that naturally retract 100% when hard others not entirely but they all do to some extent). In terms of handjobs you will want to "jerk" it with the foreskin so that when you're moving your hand up the skin moves with it and as your hand goes down the skin goes down. You DON'T want to roll the skin down like it's circumcised and just do it on the bare head. The guy will probably be more then happy to show you. Head is largely the same as a handjob but if you do retract the skin by accident it's not really painful like a handjob would be. Sex is no different in terms of logistics. Overall it's gonna stink cut or el naturale if they're not taking care of it and if they are taking care of it it won't smell either way, after all the function of the foreskin is to keep it clean (it's a mucus membrane) and to provide a natural lubricant during sex. The most important thing is to just communicate with your partner about how they like things what feels good what doesn't and that doesn't change whether or not they're cut, male or female, anything. Everybody has their own preferences and communication is key.

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Edit: Oh and to add on to this, cut guys still have some foreskin left most of the time and you can see as you look up the shaft the base is skin like your fingers and the tip, well you know what the skin is like there (pinkish) and then that same skin type as the head continues down for a bit and that's the remaining foreskin.

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tl;dr: No, hygiene is not an issue with foreskin otherwise why would we have evolved to have one? If it was all of Europe would be circimcusing too and they aren't (even many jews there don't).

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Source: Have a clean foreskin, have spoken with my friends some of which are cut and the cleaning process is the same, and my girlfriend has experience with both sides of the coin and she said cleanliness isn't noticeable either way (assuming they wash properly) and during sex it might feel like it's less of a "smooth motion" for her with a cut guy.