For a time in college (and bit after) my "move" during make-outs was to grab a condom and hand it to her. What she did with that condom at that point made very clear her desired outcome. It also gave a little insight into the person. Does she know what to do with it? (not everybody knows how to put on a condom. or maybe knows TOO well.) Does she think we didn't need to use a condom? (uh... ya... WE DO!) Looking back, it seems a little un-suave but it was sufficiently effective for me.

The last time I pulled that move, it was met with "uh... we don't need this... yet." Fair enough... we hit the brakes a bit. She's my wife now. :)