Deca and tren effect your prolactin levels it raises them. After you have sex and you go limp that's from prolactin release and that's why tren and deca will give you trouble in the bedroom. That's why you run caber with tren and deca .5 twice a week. If your still having any issues up your dose to 3x a week. I just started running these compounds together and I've always kept my test lower with great results. That is with the caber always being on hand.