You don't "get" her to do anything. If you only have had one date she isn't a girlfriend yet. If that is all you are thinking of you need to think in other ways. This is not the way to have a girlfriend.
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Tell him that u really love him then take off your shirt and if he still refuses take it off yourself
You get the girl drunk first and then go into a room Alone with them and take off yours first then shell be to drunk to know what's going on and BOOM she takes off her shirt for you