Birthday game:

The swats are 1+2+3+...+age.

First layout all the impliments.  Remove any impliments that anyone
absolutly objects to.  Then alternating turns each person selects one
impliment and can then put the impliment in the ok or reject pile.

The spankee's body is separated into three target zones: breasts, butt,
crotch (add/subtract zones for personal preferences).

The ages are done one year at a time.  For each year you need both
a target zone and an impliment.  The participants alternate turns.
The person going first selects either a target or an impliment, then
the other person finishes the selection to complete the target/impliment
selection.

As an added bonus, the one to grow on could be one of the more extreme
impliments.  The one to grow on could be a single stroke (cane) or might
be one stroke per year.