Australian base system

The American base system involves: first base - kissing and breast fondling; second base - manual stimulation of genitalia; third base - oral stimulation of genitalia; and home base (or fourth base) - the act of penetrative intercourse.

The Australian base system is slightly different: first base - vaginal sex; second base - anal sex; third base - threesome with two males and one female; home base (or fourth base) - threesome with two females and one male.

Elaine: All my friends back home go to home base by the time they're fifteen.

David: On the Australian base system or the American base system?

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