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.

Sexy Time is a time when a man has intercourse with a woman while making premiscuous sounds in a borat like accent.

Time for sexy

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A time at which you are both sexually arroused and looking good. This often leads to masturbation.

slang used instead of sex, usually by nerds or people who are to embarresed to say sex out loud infront of people.

The word more commonly used at school when something is seen as dirty or ourageous. Can create confusion with the female variety of people as you say sexy time when they bend over but in the end they will understand that its a male thing.
NB Has to be said in an

time used to make ones self "sexy" or "sexier", i.e., working out