There are creepy amounts of guys who only host young, attractive women. It used to be more like hosting anyone - young, old, any gender, and sharing travel tales.
This has been my vicarious experience. The friends of mine who were young, attractive women who tried Couchsurfing all ended up with creepy stories along the lines of "Oh yeah I stayed with this guy, and then — funny story — it turns out he only has one bed! Ho ho ho…"