Naemanson's "Talk of your feelings and ask about the SO's feelings." coupled with Gary T's counseling advice sound especially good to me. To be blatant about it: Is is possible that this is SO's non-confrontational way of commenting on your technique? It is a common thing to have happen among couples. And before GFOR becomes totally offended, I should point out that technique is a two-way street. All too often one partner or the other (or both) neglet(s) to communicate needs, preferences, or even delights.

If this is not the case, then perhaps it is time to consider the introduction of something new. I am a firm believer in "toys". While I, persnoally, am not into what some would consider to be the freakier stuff, I do think that some good, basic things like dildos and vibrators can be wonderful additions.

I am fairly sure that most studies have shown that a good many men tend to "finish" long before women. This can result in her feeling unsatisfied and in his feeling inadequate. Making it known that the use of "toys" would be welcomed could change things dramatically.

Prior discussion might not be completely necessary. Just handing your partner the appropriate "toy" (which might just magically appear at the right time) could say all that need be said.

There are those, (he said, vaguely) who eventually begin to think of the "toys" as extensions of themselves. (It's a Zen thing).

Note: Be sure to keep all toys VERY clean and to use proper lubrication where necessary.

I hope this might be helpful, if not to GFOR, then perhaps to others.