but everyone seems to be overlooking the fact that his cycle is Deca...
Every hear of Deca Dick? Google it. If you dont mind having a limp useless noddle hanging between your legs that is only good for peeing through then continued as planned.
Otherwise if it is even a little bit important for you to be able to get a hard-on/erection then stop, listen and learn. Start reading about what Deca is and how it will effect you.