This is a big myth. Condom by itself cannot reduce pleasure by any standards. Only when you find condoms awkward, you will begin to feel reduced pleasure. Condoms in fact, take away the stress of conception.
When you know that you are not going to become pregnant by wearing a condom that feeling itself can make your sex a highly pleasurable experience. Had that been the case, condom would not be there in the market at all, it would have been disserted from the market long back.
There are many condom variants such as ribbed, dotted and textured condoms which are known to enhance the pleasures of penetrative sex to a large extent and the kind of pleasure experienced by women with these condoms may not be possible under normal circumstances.
If you feel that condom reduces pleasure, may be you have to change your perception and use a good condom to try again.