Maybe you're used to your own hand and the the way you masturbate. Have you tried going for a long period of time without masturbation and then having sex to see if that helps?
Hi Jacko, Lets start by your length of time having intercourse, for this problem your try edging, ist a very simple exercise, for this just google pegym, and under exercises you will find edging.
I think you other problem steems from using a to tighter grip when masturbating, and your finding how it differs when you inside a vagina, see a vagine does not have a grip of steel, it has a featherlight touch, so when your masturbating it should be done with a featherlight touch, see when we masturbate it has to simulate a vagina.
So please take a tip come off sex and masturbating for a few weeks, thsi should clear your brain of your grip and restart with a featherlight touch.
This way you should be OK
Good Luck
yes there are times were I dont masturbate at all and generally i dont masturbate that much ... when i used to masturbate more than my usual it was for maximum ~2 times every other day
Thank you for your response anyway I how I will get one from a pro as well
thnx i try it out have nothing to loose :)