Most of us have "aquacultured" (i.e. captive-bred) clownfish (a.k.a. anemonefish) being hosted by our anemones (anemones host clownfish, not the reverse), since so few of us are keeping wild-caught clownfish.
Some species are more apt to seek out an anemone than others (A. clarkii and A. frenatus for example), but most do eventually.