Use A good lubricant like Slippery Stuff, enter slowly, discover how deep she can accept you and learn to have finesse. The movement once you reach her maximum depth should be more like vibration -- an inch in and out. Long hard thrusting is for your hands or hers, but not for ***** and cervix. Why is this so difficult to figure out? Are you only joking?
There is no medically accepted method for penis reductions, either in width or length, except in elephantine penises (penises over 12 inches long).
I agree with above posts to take it slow with her, get her on top, and additionally, use lots of lubricant.
Women who complain about big penis size typically say that after 8 months of regular sex (more than 3 times a week) with a man with large penis the pain goes away. So get at it! ;)
dude, i know about haveing a big penis, and every girlfriend iv had says it hurt wen i was on top but when they were on top it wasnt as bad. give that a try. it gives them more control about how much goes in and when she needs to take a small break if its hurting too much.
but this is a odd post because most people tend to want a bigger penis haha. you unfortunatly cannot get smaller unless you cut it with a knife (dont do it not a good idea)
are you concerned with width or length?
Why would you want to decrease the size of your penis? Most girls prefer a larger penis.
If it is hurting her because you are too big then just try and take it slow, let her lead and make sure you make it as pleasurable as possible for her.
There is absolutely no way of decreasing your penis, sorry, you're gonna have to stick with it.