The adrenaline rush of shooting firearms is sure to make J-chicks more sexually aroused, but I would not use it on girls of other nationalities.
There was this funny story that was circulated about ten years ago.
A famous asshole who calls himself an "Adventure Writer" was trying to impress some ladies with his hard-guy image, as he always did, by telling them how he flew to Guam every summer to empty out some banana clips at paper targets. It usually works with Japanese girls but this time he was talking to a couple of blonds. Seeing the quizical look on thier faces, the schmuck finally got around to asking...
"By the way, where are you from? Have you ever shot a gun?"
The girl, who spoke fluent Japanese, said...
"I'm from Israel and the last time I shot a gun was when I was drafted into the army. We were on this ruitine patrol when we were attacked by a bunch of Arab guys with rocks and we had to cut them down because we thought they were throwing bombs."
Just try to imagine the look on the asshole's face as his balls shrunk to the size of raisins.