At 50 mg zoloft your sex drive may return(best scenario).
You could also try skipping just a day or 2(drug holiday) to see if that helps just on occasion. Might be enough every so often to keep him from getting....... too randy.
I feel for both of you.
Some try and dose or two of wellbutrin for loss of sex drive. Some try another ssri like prozac which I take and have no loss of sex drive. Alankay