From a more medical perspektive:
Well you could ask your doctor if there's a safe way (remember: safety comes first!) to incrase your prolactin levels. A high prolactin level can cause erectile dysfunction and loss of libido in men, since it partially counteracts dopamine (which causes sexual arousal), and causes breast growth in women during pregnancy, so it >>could<< also help temporarily with breast growth (no data on that). However a too high prolactin level can cause lactation and increases the risk of breast cancer, so consult your doctor.
The other possibility would be a dopamin-blocker, but that would lead to unforeseeable side effects since dopamin is far to important for numerous body functions. A few of the side effects would be probably loss of motivation, depression, partial loss of motoric abilities, parkinson, ADHD, RLS, and so on...