selectively permeable membrane


a hot girl’s v-g-n-.
very selective on who’s d-ck is permitted through the membrane (her p-ssy lips.)
will often deny nervous, non-jock types. the membrane judges largely on physical appearance, not on the pretense of a good personality or wit.
guy 1- so did you sleep with elena in the end?
guy 2- no, she had a selectively permeable membrane.
guy 1- … so she turned you down?
guy 2- yeah.
guy 1- well just say that then!
guy 2- i needed to make an example for a definition for urban dictionary, okay?!
guy 1- oh, right… wait a minute, am i on tv?!

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