Google, Google,Google.
Don't ask here.
Just make sure you don't end up on any Trojan installing porn websites.
Look for forums more geared for that sort of content than TSR.
Try a few things that you find from your Google research. Keep an open mind.
Expect it to take a few sessions for you to get tuned into your girlfriend.
And well done for having the desire to improve this. She will appreciate your efforts.