Which subatomic particles are into BDSM?

Top and bottom quarks

A particle physicist met a quark collector...

... and discovered the latter, named Richard, had managed to get his hands on two of the most elusive quarks - the notorious up-quark and the sought-after down-quark.

Now the physicist was a bit of a connoisseur himself, and had managed to get his hands on all the four other quarks and their ...

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