In my opinion, bars are your best bet. Most websites for these are fake.
Back in the days there was a place in Ft. Lauderdale, FL, which was a known place for picking older and richer woman. You would just go there nicely dressed and if someone fancies you they will offer you a drink. If you accept, they know you accepted her ‘invitation’ and they will approach you for a dance. If you hit it off, they will invite to their home.
I had a wild time on the dance floor but chickened out when she invited me to her home.