Paxil and Sex Drive

I have been on Paxil and Wellbutrin for over 5 years and have consistently experienced reduced sex drive.  Very often, reaching and maintaining a full errection is no problem at all.  Wellbutrin may explain this.  The problem is always reaching a climax.  My partner is more than satisfied, but then has to endure my continued efforts to reach climax.  I've tried getting off Paxil, but that's not an option for me---terrible experience.  The sexual side effects are the lesser of two evils.  Is there a Rx that can replace Paxil? I'm a male, 50's, excellent health other than anxiety/depression. Any comments or recommendations.  Thanks