Girl or Guy, never is it appropriate to start referring to
sex or your genitalia with a whimsical and childlike fancy or preschool like nickname...jokes are one thing, but phrases such as "Jack and his bean stalk" and "enter Miss Fee Fee's playhouse" should never come out of your mouth! Especially on the cusp of sexual interaction.
Stick to the basics and don't pick a cutesy name that makes your lover cringe..instant dry up/ softee. Always a no go.