Home Plate
                         /   \
                       /       \
                     /           \
                   /               \
                 /                   \
               /                       \
          Kissing         (=)     "Heavy Petting"
               \                       /
                 \                   /
                   \               /
                     \           /
                       \       /
                         \   /
                      "Feeling up"  








                      HOME RUN!
           (Getting laid)

Most troops don't even make it off the plate...
If you are young enough to use bases, then you have probably never made a "home run" with anyone.

See Also: First base, Second base, Third Base, Home Run