longer orgasm

Hi Dr. Betty,

I actually have a question for you. I've been having trouble finding an answer to this question on the internet, and was wondering if you could give me some insight on it. I find myself not able to have an orgasm per vaginal penetration, so my boyfriend has a difficulty giving me one and is getting a little frustrated and I am too. The only orgasm I can seem to give myself is clitoral with a vibrator, sometimes with this penis. Maybe you can give me some tips on how this can be achieved. Also, one more question if you could...When I do have an orgasm with my vibrator, it only lasts 3 seconds, is that normal?? I would love any advice you can give me.