AAS is not mutagenic nor does it affect DNA replication or repair, and hence will not harm your germ cells (sperm) nor your somatic cells (the rest of your body). Its really that simple. But you probably will not find a scientific article stating this explicitly, and if a scientist tried to publish such results, they would be laughed out of the business, because it is that obvious. This class of compounds (steroids) also includes glucocorticoids, estrogens, mineralocorticoids, etc, none of which have ever been shown to harm DNA whatsoever. In fact, your body makes lots of cortisol and even testosterone each day, so there is no way "nature" would have evolved the use of these compounds if they had any sort of mutagenic activity.