Seeing as the clit sits up and out of the way, it requires some creativity on stimulating it while screwing. I love to have my clit rubbed, or I rub my clit myself while my guy is inside of me. Perhaps your wife needs to do some fingering of her clit while you screw.

Position matters, at least to some. My wife easily gets off all the time if we "scissor" our legs (each with one inside and the other outside of each others legs). Puts a lot of pressure on her clit this way, with her either top or bottom.

thanks for your answers. Stuff we never learned reading books and mags.
now my and i masurbate each other all the time, and have some of the best orgasms ever

A small percentage of women have a low placed clit where it's well down in their vulva right close to their vaginal opening but the majority have it higher and there are some with high placed clits where they can get no senstation from intercourse at all.

I think there needs to be more research into clit position as there are large numbers of women who cannot cum from intercourse and who would like to and this matter of clit placement is rarely if ever mentioned by western sexologists.