So, sometimes adults want to have special fun time with other adults. This is okay, as long as everyone is a grown-up and agrees to it. Sometimes people don't have partners to do this with, so they might try meeting someone new.
This is where cruising for sex comes in. Cruising is like going on a special hunt for someone to have fun with. Instead of using a map to find treasure, you use your eyes and walk around looking for other people who might want to join in on the fun. Sometimes people go to special places like bars or parks where there might be other people looking for the same thing.
It's really important to remember that it's only okay to do this if everyone involved is a grown-up, and if everyone agrees to it. Also, it's important to be respectful and not bother people who are not interested or who might not be old enough to participate.