Just to add on to what you're saying, I'm uncircumsized and even in a condom the end of my dick is rubbing against skin most of the time. Depending on just how hard I am, or just how much precum there is, or how lubricated the lady is, I legitimately cannot tell when it happens as I'm getting almost the exact same sensations. I've had only three wardrobe malfunctions my entire life, and I never noticed until afterwards in each case. Not to say that there aren't scumbags out there that notice and just keep going, etc., just giving my 2 cents about how it's not the same for everyone and you can't always tell immediately.