Hooked up with a girl last night and it just wasn't happening... Struggling to keep an erection and there just wasn't any passion, despite her being skinny and attractive.

So now I'm wondering like, 'damn, do I have a problem? Why would I ever struggle with a hard-on of all things?'

Then later on, I hook up with my main girl, who is also hot, but the total opposite of this girl in terms of looks and chemistry... Boom. Rock solid again.

Does science have anything to say about this? Have you had such experiences? I just wish when I was younger (like 18) someone had told me, 'hey, if you can't get it up, maybe it's because you just aren't turned on by that girl- it doesn't mean you're in the wrong. She should either try harder or you should just peace out and go for another girl'.