Re: Size and Vaginal Orgasms
Of course size matters. Luckily, most sizes are average for both men and women. The average penis will fit and satisfy the average vagina.
It comes down to a matter of technique for most people. Stamina is also important. A woman might be getting close and if the guy has to take a break at an inopportune moment, the build up can fizzle and be gone.
Try to practice being able to go fast and hard for a long time. Say at least 5 minutes straight, before you might have to go slower for a while.
Not every woman requires machine like motion, but for some it's the only way.
You should probably lay off the vibrator for a while too, if you want success with making her orgasm using just your penis. As you say, a vibrator is much more intense than the average penis.