My guess is that you and your girlfriend were sitting on the couch with nothing to do, and she leaned into your ear and whispered, “Hey, let’s go do something together. I’m thinking something fun and explosive, a little dirty and naughty. Something others would disapprove. Let’s see how…natural….it feels.”
And instead of giving in to carnal temptation, you found something to do that met her description that isn’t explicitly prohibited in the Strength of Youth pamphlet.
Props to you, man.