When your practicing how to seductively greet someone with an animal nickname to make someone else uncomfortable, and your parents think you are a cam-boy who's watching porn and feel too intimidated to say anything.
Friend: Why didn't your parents talk at all when we were at your house?
You: Oh, I got too into Sexy Time, and the prophecy unfolded.
Sexy time has begun refers to one of the two;
1) When someone wipes out a squad, team or comp in a game or comp.
2) When a Man/Woman engage in sexual intercourse with another partner.