The science of Clapology?

Okay so at one point i was sleeping with 5 girls during the same time frame. I ended up with clap, so i went down to the VA and got my shot.
But i was hella curious which one of these broads i got it from, so after my shot i did em all one by one with a clap test after. All negative... No more clap.
I put it in two of the girls butts, but didn't repeat after the shot.
So over all i guess the question is can you have clap in the butt only? Lol.
The science of Clapology?
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