Yeah, I forgot to mention in my posts that not skipping on the foreplay is the best way for you to have your girlfriend primed for sex. When she's really turned on and has been in that state of arousal for a while, she'll have probably lubed herself up and loosened up quite well.
As far as women not being able to get off from only vaginal intercourse... nobody said she (or you) couldn't be rubbing her clit while you are plowing her. 
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"The question isn't who is going to let me, it's who is going to stop me." (Ayn Rand)
"The truth is that our finest moments are most likely to occur when we are feeling deeply uncomfortable, unhappy, or unfulfilled. For it is only in such moments, propelled by our discomfort, that we are likely to step out of our ruts and start searching for different ways or truer answers." (M. Scott Peck)
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