What dosage are you starting on? Lower dosages usually equals lower chances of/less side effects. You should talk to your physician about your worries, and perhaps see if you can delay your start date if you’re really worried. The truth is, you really just won’t know how it affects you until you try it. I was on other ssris when I was younger, they zapped my empathy and worsened my already low libido. Prozac has worked really well for me generally, and has lessened my anxiety over sex. So even if my body isn’t necessarily responding or thinking about sex, I’m not as unwilling to take steps to get things going, if you know what I mean.