Or better yet.

The parents notice that the heart rate has disappeared and they rush over to stop the impending sex (because she has taken the underwear off and no signal is available)

They bust through the doors while she is at a party. And she is sitting on the toilet doing her business... lol..

That would be a picture for the yearbook.

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"When two people agree on everything, one of them is not necessary" - Arliss