The biggest reason for the "impotence myth" was that since steroids make you MORE of a man, bigger, stronger, faster, jealous people made it up as well as they made up the fact that your penis gets smaller because they tried to belittle the users and their gains. As in when a woman sees a big buff guy and she says WOW to her 120lbs "boyfriend" he can reply that: "they are big and strong when using but cant have sex!"
The only sides that i'd be worried about are BP and lipids, but they can be kept in check by common sense with dosages and ancillaries.
I have done deca only cycles and fucked like a champ.