*lol* @ Exquisit.....
CRANK?
, I've never heard of "it" being referred to as CRANK! *lol* . And I thought I hated the term " Bump Uglies"!
But back to the question....
I would say that in general there is no magical number. There should definitely be no "cranking" going on until a frank discussion has been had concerning feelings, sexual history, current "disease" status verification, etc. This rule applies to all of us, regardless as to what you're plans are (i.e. saving until marriage, waiting for a LTR, etc.).