Hi Tarek, Lets start with your foreskin problem, well you need to start to steach it, get some baby oil on it, and just play with it getting up and down, and start pulling at it gently with both hands sideways and lenthways, till you get to the point were it can move up and down without getting stuck, when you can do that you should be ok, does this sensitivity cause you tyo ejeculate early, if so google pegym and on there look up a simple little exersize called edging, you may find this helps.
Ok allways keep behind your foreskin clean, clean it daily, this is anotherway of getting your foreskin up and down, and by doing this is another way of losing sensitivity.
But next time your there all naked with a women just say take you time and plese be gentle, use some kind of sex oil.
But please be safe be clean.
Good Luck
Stop worrying about what's "normal" and ask your partners to do what you like. Plenty of women can't take direct clitoral stimulation while others can, and it's a very individual thing. They just ask their partners to do it the way they like it (if they have any sense). It makes sense that guys would be the same way. One trick is to have them watch you masturbate and ask them to try to imitate what you do. A good partner will be willing to adjust their technique to make you feel good.
Tips on masturbation.Use lubricated hands. If someone else is masturbation you may ask them to lubricate their hand. You may relax perineum (muscle between legs). visit pengym website(pegym.sp?).