I did see some stills which were alleged to be of the incident in question, and it did look like him but they were taken from overhead so it was difficult to say for sure. Those pics cannot be found on the internet any more, apparently.
The same can be said for the photos of him, obviously drunk, dancing with his hands all over some girl’s arse at a ski resort a few years ago. He was holidaying with friends and without Kate. Which, if you believe the reports, is a fairly common occurrence.
The French court case which William took out a few years back was supposedly to suppress photos of Kate giving him a BJ on the balcony of a house they were holidaying at (I think it was Viscount Linley’s holiday home). The issue being litigated was privacy as the pic was taken by paps with long lenses. I don’t think it was reported in the UK press, though I could be wrong. The French press referred to the offending pics as depicting an “act of marriage”.