FWIW, I'm on TRT, 200mg Test Cyp a week with HCG. While it's tough to compare because before TRT, I had some erectile issues, but now, on TRT, my erections are much thicker, fuller, and longer. Combine with a pde-5 inhibitor (pycnogenol & AAKG/Citrulline Malate or cialis/viagra) and it's to the point of painful. Flaccid size is no different, but my erections are indeed stronger and larger. So maybe it didn't spur actual growth, but the overall increase in erectile strength did achieve more volume.