Lol that was somewhat clever.
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A boy comes home from school with a note saying "I got caught at school having sex." His mom yells at him for a while. Then, his dad comes up and says- Son, it's ok to have sex at school. The kid says- Really? Okay...
Next day the kid comes back from school again- this time without a note. His dad walks up to him and says- Did you have sex today?
The boy replies: No, my asshole still hurts from yesterday!