I have never had this problem before but since I got with my current partner I can't last nor satisify her. What is wrong??

How old are you? Do you have any medical problems? Are you on any medication?

I am 29 with no medical problems or medicines.

How long have you been with this partner... how long were you with the last one?

Could be over excitement from being with a new partner if the relationship is still in its very early stages. If that's the case it will improve when the newness wears off since you didn't have this before. If this has been happening for a while, like over 6 months then we need to take a look at other possibilities.

We have been together for almost 4 years and this is really bothering me. She says its OK but by her body language lately it is becoming more of a problem. I just don't want to be a disappointment to her.

Yeah... after 4 years the new relationship excitement has worn off.

Question... what about frequency... do it very infrequently and its going to be quicker than if you do it every day or two.

Also... how quick are we talking?

As a second part... any foreplay. Keep in mind women in general aren't going to be satisfied simply with you poking around for a while. That's perfectly fine for most guys but women aren't generally quite that easy to please by a long shot.

And of course, with her , most of her enjoyment will come not from actual intercourse but from pre or post play