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When you are laying down with your gf, and starting to relax, start to randomly jump up shouting REEEEEEEEEEEEEEEE, at a ridiculously high volume.
Do this every five minutes or so, you might also want to run around in circles stamping your feet and spitting on the floor.
This will A) Scare the ants.
and B) impress your girlfriend with your insect scaring skill.