I don’t think we’re on the same page here. When I say proper, I’m referring to a special position, not a basic one. There are 4 types of orgasms. A clitorial, a vaginal (g-spot), a blend of the two, and a multi-orgasmic one. The only reason I can think of why you personally claim you cannot experience both orgasms simultaneously through penetration is either you were not aroused enough prior to penetration or you or your partner don’t know how to position yourselfs for it. This is 20+ years of experience talking. What you’re saying simply isn’t true. You can achieve a vaginal and clitorial orgasm simultaneously through penetration.
One of such positions is for a female to align her hips and tilt her pelvis upward so that the base of a man’s penis is on the clitoris but the rest of him is inside you. The idea is the man grinds against her pelvic bone instead of thrusting up and down. Another position is having the girl on top or on the lap of the man (not facing towards the man). The idea being that the man stimulates the clitoris in this position and the woman controls the thrusting.
Even a multi-orgasm can be achieved through penetration but it all depends on a woman’s tolerance of continuous stimuli after an orgasm.
Again, what is most important is to stimulate the correct area and to maintain a constant stimulation. It doesn’t matter if it is slow or fast, although switching from slow to fast and visa versa has a stronger impact. Prior to penetration, foreplay goes without saying.