I'd never mark a spot in such a public way, but something related...

There's a mountain lake we like to frequent in the boat and we went with another couple one weekend. My buddy started asking me how my GPS/ChartPlotter/Sounder worked. I gave a demonstration and quite a few spots on the lake showed up in my personal waypoints as "booty", "bj" etc. etc. Turned out we had fucked in every decent cove on the lake but my point is...well, I forgot my point.

Don't mark where you have sex, kids.