Adult content is in a lot of social art, not just things like furry.
In fact, figure drawing classes can be very much mature in nature if not directly explicit (and although I've hardly participated I can say this).
Another factor is that adult content sells primarily because it's a form of exhibition for people's fantasies and a lot of people stereotype adult nature as being a "wild animal" thing, a likely reason why so many connect to that side of furry.
The artists I favour hardly make much adult content, however, since I do not really enjoy looking at other people's characters in what could be described a public act of affection. I do not follow in lust, I only trust love and I am very much avoidant of mature content of any kind. I also have a mate and seeking out adult content just makes me feel like I'm somewhat "cheating".
I'd recommend you try out sites like deviantArt if you don't already, you'll notice there are many good, talented artists if you can see past the mass of beginner fan artist on the largely PG-oriented site.
Just find the artists you like, follow them and perhaps even follow in their pawsteps if you so choose?
Certainly, I've noticed how people say a lot of things are overly "sexualised", including the pop industry, some forms of manga/anime art, etc.
Also, note don't use the keyword "furry" all the time, furry isn't really a used term for genre these days, it mostly refers to the very "hardcore" fan base, i.e. the types of furries that pull furry aspects into every part of their lifestyle (that includes sexuality).
I can't say a lot as quite a hyposexual on how mankind seems very much based on sexualisation so I just say "each to their own", I'm not even going to pull the "can't beat them, join them" card, one person's hinderance is often another's source of pleasure.
But all in all, understand that sex sells, just go around it, you'll find more of what you seek - suggestivity is everywhere, to get popular at character art you need to generate a sense of "attraction" to as wide an audience as you can (often sexual attractiveness + intensity + decent sense of anatomy = attractive) - I'm sure there's plenty that prefer or just like to see a lot of clean art for a change.
If you want to support clean artists, you could always become one yourself - the world won't change just for you and the like-minded in numbers can cause revolutionary changes.
If I ever get good at art, I hope to go the route of clean art.
For now, just keep looking