the best way to understand is to understand what it feels like to have a penis the erect penis is like this amazing thick finger, every inch of the large finger reacts to sensation and tingles with pleasure when touched. Now this long sensitive finger is slid into this warm, wet, soft place; i'll call it her hand . You can feel her holding your finger in her hand and every inch of her hand is supple and is grasping every inch of my finger. I can use my hands to caress her breast (which is a whole other article of man pleasure) and my other hand to hold her hips to guide my finger into this perfect shaped hand. now my finger is being hold firmly, inside her, and slowly i feel this pressure building. (psychology i find it pleasing to be in her) I move faster trying to catch this hot warmth in my tummy. My finger keeps exploring her hand and every inch is full of warmth and softness. then i let this pressure (know sex for me is a lot of holding in) go (the only time i would naturally make any noise of pleasure and the pleasure of relaxing is almost impossible to not make a sound) and my lower mussels tighten and it's even warmer and wetter at this point every inch of my finger is more sensitive, 3 times as sensitive, and then I just want to sleep.
What part of your anatomy consists of aquatic bivalves? (I must have missed that day of biology class.)
Complicated question....Different women feel....different. And the same woman can feel different at certain times. Guys for the most part though are lacking in the whole body participation.