If you have plans to meet up with a girl, invite 2 of your friends out who are in a relationship. Don't tell her anyone else is coming until the last second. This will force a double date. Just tell her your friends you haven't seen in a long time wanted to hang out, and you invited them to tag along.

You now have a 80% better chance of having sex with the girl because she will see your two friends who are happy and in a relationship, and she will start to crave it. Girls always look at other couples and wish they had that kind of happiness at that moment. When they see a happy couple, they realize what they are missing and they will become easier. I've seen this phenomenon several times.