The Moon is a Harsh Mistress is pretty much a how-to-do-it libertarian takeover tract. Don't get me wrong, I still liked it anyway. But Heinlein's non-juveniles do tend to be on the agenda-pushing side from time to time.
Robert J. Sawyer is pretty much a modern-day Canadian Asimov*. Lots of optimistic sf exploration on how technology and discovery will shape humanity, hopefully for the better.
While not exactly squeaky, his works are reasonably "clean", I'd say. The profanity in them is not used often and tends to be of the theological rather than the bodily function variety, and I can only recall two even moderately-described actual sex scenes in all his books†, and I've read them all except for the very latest one.
He's a multiple Hugo/Nebula nominee/winner and he's put up some of his award-winning novellas and short stories to try out for
free on his website.
I'd say that
Just Like Old Times,
You See But You Do Not Observe,
The Hand You're Dealt, and
Identity Theft are most representative of his usual novel-length work, as well as the level of social commentary and language explicitness he tends to put into his stories.
Give them a whirl and maybe you'll end up with a fairly reliable "safe" author you'll mostly be able to depend on for good sf stories that will often fit your criteria.
Also, second the rec for
Mike Resnick, who often has fun, slightly retro stories.
But you'll have to be a bit selective, I think, in order to fit your list of requirements. Resnick's perfectly willing to swear up a storm and put in no-holds-barred sexual description if the story premise calls for it (cf. one of the stories I can't remember the title of from
Will the Last Person to Leave the Planet Please Turn Off the Sun?, from the viewpoint of a stalker/voyeur).
I also really liked the
Bureau 13 books mentioned above, if they're the ones written by
Nick Pollotta. They're available
DRM-free via Fictionwise, who occasionally have deep-discount coupons you could apply to bring the price down quite a lot.
No real sex scenes in them (though definitely a Heinleinian level of suggestive teasing between couples), but I won't swear that they're profanity free. But I think I recall them mostly being fairly light and mild on the swearing when it occurs. If you're interested but concerned, I could run a word-check on my e-book copies for any terms you'd think you'd find offensive enough to want to avoid if they occur more than X times per book.
* For anyone keeping track, I'd say that Peter Watts comes closest to being the Canadian Clarke (albeit an angry punk Clarke) and Tanya Huff is closest to being the Canadian Heinlein.
† In case you want to absolutely avoid them, they are somewhere in the
Quintaglio Ascension trilogy, about dinosaurs discovering science, and in the
Neanderthal Parallax trilogy, about encountering a parallel world where it was Cro-Magnon man who went extinct.