Google Trends allows you to enter search terms and compare the frequency with which they have been entered into Google by the population over time. You can select an option to restrict the graphs to only searches within the United States. (The letters and flags in the graph refer to news stories based on the term in the sidebar that add little information and, annoyingly, cannot be turned off.)
In the US, searches including "football" exceed those including "porn" for most of the pro and college regular season, while those for "basketball" only exceed "porn" during March Madness, and those in "baseball" never exceed "porn."
I will leave it as an exercise for the reader to figure out the timing of the annual spikes in searches for these terms. Note that the second annual peak for "flowers" is higher than the first.* Consider also what the difference in the duration of spikes suggests about the advance thought given to the different things.
* Comparison of searches for "flowers" and "lingerie" show a spike for "lingerie" that coincides with the first peak for "flowers" and not the second, which I think is probably a good thing for society.