Exactly ! The OP said he knows some places are clean, there’s no guarantee that it’s 100% safe. No way you can see the test results of every girl there, regularly, before you declare it safe.
And even if the result received today says clean, she can be infected by the customer the next day before you see her the following day !
To be absolutely safe, stay home, don’t do 3some or 4some, just do handsome !