See that's just reckless ass behavior. Which is why it's just smart to get yourself and the person you deal with tested beforehand. Men & Women are reckless these days.
This is impractical and no one is going to do it. If people actually did this the CDC would have a fukking field day and then panic because half of them would get laid off and the program would be defunded.
Another problem as I mentioned above is that tests don't cover everything and you can still get yeast, staph and fungal infections along with molloscollum and protozoan infections that only can be cleared by the body's immune system.
The steps are the following:
1) Always use a condom with adequate lubricant. Learn to pay attention while you're stroking and periodically check if the condom is getting dry.
2) Do not engage in eating out a female unless you want Michael Douglas throat cancer
3) If you are going to engage in oral sex always use a male or female condom.
4) Pee after intercourse to avoid simple UTIs and bladder infections (these are NOT STDs but basically just friction during sex rubbing your own skin's bacteria up your urethra)
5) Men after sex wipe down your dikk, balls, thighs and pelvis below the belly button with alcohol 70% wipes you get from the pharmacy
6) Women take probiotics daily drink adequate water and after sex rinse the vagina out with lukewarm water and diluted castile soap
7) Men take Zinc daily to improve libido and immunity even if you take a multi take one extra zinc capsule (Krebs form Only preferably)
8) Women if you are not taking birth control pills then take evening primrose to balance out your hormones which will reduce chance of infection.
I know most won't follow this advice but it is a hell of a lot more practical, reliable and effective than testing every man or woman you are going to fukk on a saturday night after getting drunk at the bar.