Notice how one seat is up and the other is down.
Someone has their pants down turned around, while the other is behind them and facing their direction.
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@lucifargundam Well, if you sat on the toilet backwards, I suppose you could rest your elbows on the tank. That might be less awkward for one of them, but maybe more awkward for the other.
@ambulocetus
The implication was that they had an intimate moment.