if someone used a "
medium," for example below the "
mug," and that person did something, the next person who uses that medium basically did that
same thing.
if you were a guest to your friend's house and you just happened to use his mom's
mug, well your mom gives your dad a bj, then your friend has just sucked
your dad's cock by proxy. Another example is, if a girl co-worker has slept with 10 guys and a guy co-worker ate the girl
coworker's left over sandwich, then the guy coworker just slept with those 10 guys by proxy!