To answer your question, Glen, yes sexual abuse most definitely effects adult sexual life for many men.
You are definitely not alone in that area. The hows and whys and most importantly how to overcome those difficulties seem to me to have been best addressed with a sensitive therapist.
As for the drugs, I won't repeat what has been said about them.
But I always am moved to remind others and myself that the Depression the drugs are meant to treat, itself has severe deleterious effects on sex drive, erection, orgasm and many others facets of male sexual behavior.
And this I know from my own experience. Once the depression improved, my sexual life improved, in spite of the fact that I continue to take the meds (Effexor, Zoloft, Gabitril).
I can tell when my depression is improved because I wake up in the morning with an erection. Nice surprise after many months of complete lack of sexual response!
Hope this helps.
"Poke salad Annie, 'gators got you granny
Everybody said it was a shame
'Cause her mama was aworkin' on the chain-gang"
-Tony Joe White