At SFSI during training of sex crisis counselors, the “first base”, “second base” model for sexuality is referred to as the “baseball diamond model”. It stands for both the euphemisms xkcd explains above for “scoring” with a sex partner (the stages of penis-vagina intercourse goal achievement) — and also for the limited sex acts typically perceived as “normal” sex. Which, as we say, is great if all you want to do is run around in circles. This explanation is going to have to go into the next round of training, for sure.
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