My gf and I had sex when we were 20. It's so awesome! She told me personally that she feel great having sex with me. I felt awesome having sex with her too! After that sex, both of us just couldn't stop and we had another few sex other days again.
As of when do girls want sex, it depends on individually, because some may not be as open as others. And if only I can meet you, we can have sex together. You seem open.