Maybe your penis is telling you something.

ah but tellin him wot tho? that he shouldnt cum on her?

How aroused are you when you begin intercourse?
* Very very very and on the brink?
* Very with a ways to go?
* No so much and a long way to go to get there?

I am seeing a trend of late that seems to indicate that a lot of guys are beginning intercourse way too soon in the scheme of things. In other words, they are going in and stroking and stroking and stroking and stroking in the hope of building up their level of arousal and sexual tension from all the action when in fact they should be accomplishing this from all the foreplay and making out that has gone one before.

It is important to devote a lot of time to making out and then to include foreplay into the mix so that when you do begin intercourse, you are very near the peak of your arousal yet can still maintain control. Stroking simply maintains a pre-existing high level of arousal. Thrusting peaks this and carries us past the trigger point. More and more guys have the misconception that lots of stroking is the way to increase arousal--WRONG. So, if this is what you are doing, please change your tactics and strategy as described, above.

If not, and you are doing things right yet still find it difficult or impossible to get past the trigger point, try this: When you are at the threshold of a climax and it just won't happen, pull out and have your partner stroke your penis briefly and then go back inside. Timing is critical as is not getting too far away from her because you will probably only have seconds or less to get back inside. The idea is to get so close that any movement from stroking will trigger your orgasm.

It doesn't sound like you have a Performance Anxiety issue; rather, just a problem of being able to trigger an orgasm from a different pattern of movements and sensations than what you are used to when home alone. If this is the case, just practice and retrain your brain to accept these new sensations.