Is it normal for me to find men attractive only when they have clothes on?

It's their flobbery tackle which puts you off and for good reason. It looks like a sack of mutant organisms loosely bound with a calves pancreas and left to rot in a butcher's stoop.

I wonder how you look naked...that would be interesting to see...I remember this ugly broad complaining about how I looked and I said, have you ever looked in the mirror? I am doing you a favor and I may leave without killing you, another favor but not for the next poor bastard who sees you naked.

Blindfold, maybe?
Try to get them to approach from the rear perhaps?
They could also try to get started when you're asleep.