What should you do if your Girlfriend doesn't put out?

A relationship is not about sex. Your girlfriend wont put out because she isn't ready for it mentally and maybe she doesn't feel comfortable enough with you yet. If you've been dating for a while then just openly talk about it it's the best way to solve your problems; But if its only been a few weeks or maybe months give her time. It's not the end of world if you don't have sex. If you truly care about her you will wait and take her feelings into consideration.