I used to do that back when I never exercised or left the house, but now I work out daily so there's absolutely no excuse for me not to shower after every go, because I don't stop until I'm sweating like a beast. Once I got into the swing of things, the shower became a reward in and of itself, because a shower after 5k or a monster lifting session is like having water nymphs give you a full-body rubdown. All the other small stuff (shaving, oral hygiene, even lotion if you can believe it) soon followed as a "hey, why not".
As far as knowing other people that do this, I don't make friends with those kinds of people, so that just leaves my father. He's not unclean, but he is a heavy drinker, so there have been mornings where he absolutely reeks of whiskey sweat when he decides not to shower before work for whatever reason.