You can read this article by Merely Me, a writer and the community leader for this site, titled, Which Antidepressants Are Least Likely to Make Me Gain Weight? The comments too, are helpful. From being on this site for awhile, it seems that Wellbutrin is one of the the drugs which are least likely to affect both. Whether that would hold true for you, there is only one way to find out and that's to try it.
She wrote another article, titled, Are You Depressed, Taking Antidepressants and Losing Your Libido? What You Can Do About It. The comments may help there, too.
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