Just for the record, Wellbutrin isn't an SSRI, as it affects the dopamine level in a person's brain and not the serotonin level like the SSRI's. It's true, though, that Wellbutrin doesn't have the bad sexual side effect reputation that the SSRI's have. I'm on Wellbutrin and my doctor told me that Wellbutrin has the opposite effect (it actually INcreases a person's libido). That's unfortunate for me, though, because I already had a much higher sex drive than my husband.
If I were you, I would definitely go to my doctor and mention the sexual side effects that you are experiencing and ask about the possibility of switching to something else.