The Fornite Pro-AM tournament saw YouPorn traffic drop by almost 17 per cent.
The competition had 50 celebrities battling alongside 50 Fortnite pros and streamers at E3 last week, bringing in 1.3m viewers on Twitch.
At the start of the tournament, traffic was three per cent above average, before dipping to 13.57 per cent below its average viewership during the next two hours. Five hours after the Pro-AM had finished, traffic returned to normal.
Ninja and musician Marshmello won the tournament, donating $1m to charities of their choice.
Speaking of Ninja, the biggest streamer on earth playing Fortnite with Drake saw Fortnite-related searches on rival adult site, PornHub, rise by 824 per cent. Which is mental.
Fortnite recently hit 125m players, with developer and publisher Epic Games putting $100m behind tournaments for the battle royale giant.