Pioneering thumb


the act of inserting an exploratory thumb into the -n-s of a girl whilst in the doggy position. if this is met with a positive reaction, or indeed no response, it can be taken as permission to change holes.
friend 1: did you sh-g her then?
pioneer: yeah, f-cked her up the -rs- and everything. she was a right dirty sl-t.
friend 1: sound, how did you manage that?!
pioneer: well you know, just slipped in the pioneering thumb.
friends 2 : unbelievable tekkers.

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