"Last Time" joke

A woman walking past a pet shop sawa a sign that said "tit sucking frogs".
She went in to buy one and the Pet shop owner gave her a little green frog.
She took it home, got undressed, and waited for the frog. Nothing happened.
She calls up the pet shop owner and comes around to her house. He picks up the frog and says, " Now this is the last time I'm going to show you how to do this"

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