So, I was talking with my roommate, and I was asking him if he can feel different things in the vagina, such as if he's going past her cervix and into her fornix, when he's penetrating a girl. He says that you can't. He says it's not the same thing as feeling with your fingers. He says feeling with a penis is not going to give you the same sensory information you'd get from feeling something with your fingers. The example he used was if you dropped your cellphone between a seat cushion in your car and you're reaching down to feel around for the phone. He says that using your hand or fingers, you know where you're at and you could feel around to find your phone, but if you tried feeling around with your penis, you wouldn't get any information, you'd be lost. Basically, fingers can read Braille, but a penis can't. Is this true for all guys?