Deca Dick is NOT in your head. I can assure you it is VERY real. My advice, regardless of what you've paid; leave that shit on the shelf. Better to lose some money than risk losing your cock. Granted, you're planning to run Test along with it, which would significantly reduce the chance of the dreaded DD. BUT, this is still no guarantee Deca, due to it's progestagenic activity, won't mess with your HPTA. So, if I were you, I'd play it safe, and substitute EQ instead. Besides being a better compound pound for pound, it isn't NEARLY as suppresive of your own natural endocrine system. Deca on the other hand, is the worst offender of them all. From what I've read, the odds of it's nastier aspects surfacing seem to increase with age (I'm 31 now). But, this isn't always the case. My friend, who's 23, and did the exact same cycle, is even MORE f**ked up libido-wise than I am. Heretofore, I used to LOVE doing Deca only, or EQ only cycles, because in the mid to late nineties, both were considered to be the safest of the safe steroids. Great gains, with minimal sides, and all literature at the time (i.e. World Anabolic Review, 1996) supported this notion. I read a shitload of books on AAS steroids before even doing my first cycle, and it wasn't until my coming on these boards in search of help, did I ever hear of the term "Deca Dick." Even then, I took it with a grain of salt. Six months and many sleepless nights later, pondering wether I'd permanently ruined my HPTA; I now view Deca as Satan incarnate. I wouldn't recommend this shit to my worst enemy (and that's saying something). Granted, I did do practically an all Deca cycle, so I was setting myself up bigtime for a major case of DD. I just didn't know this based off my prior outdated knowledge, which I thought was still current, the consensus within the medical community that Deca is safe, and my previous positive experiences with it. I assumed things would be just like the good old days. Boy was I wrong. Everyone's different however, and just because this happened to me doesn't mean it will happen to you. So, take it at your own peril. More than likely, with the cycle you've got lined out, things will be cool. But, after what I've gone through, no way in HELL would I take the chance. Furthermore, if you think DD is unique to just a few people here and there, think again. Do a keyword "Deca Dick" Google search, and see how many links pop up. Here's an old elitefitness forum one almost entirely dedicated to it:
http://www.elitefitness.com/steroids/deca.html