I've used this position and it allows the man to last longer because the penetration is shallow and in addition to the fact that it gives great direct stimulus to the clit it also gives the woman psychological pleasure as it blends the masculine and feminine aspects of sex together so that it results in a greater sense that she is the active partner and he is the passive one.
But here's another great secret move for you to try which will put a monkey on your back for sure. Lie on your back and have your man penetrate you from the side. Then get a second man to lick your clit at the same time. You can also achieve this in the reverse cowgirl position. In those rare cases where you can't find a second man to perform the oral part of the act another woman will also admirably suffice!