Oral Sex but No Orgasm (male)

<span class="postbody"><span>I have never been able to achieve orgasm during oral sex.  Every women i've been with has given me oral sex, but i've never been able to achieve orgasim.

My wife of three years wants to please me and thinks she's doing something wrong. </span></span>

<span class="postbody"><span>Are there any treatments to improve sensitivity????</span></span><span class="gensmall"></span>