Yes, I've noticed it can be harder to cum on Tren but this can be a good thing when you're looking forward to a marathon session. The erection issue has never been a problem for me, in fact, feel I can be harder for the mere fact that my sex drive is ramped up from the Tren. Note: I do use Cialis and always have so I have no comparison with or without it and I've never experienced any prolactin issues with Tren. I only use Tren on occasion because the known sides do hit me with even the littlest bit of use.Thing with the tren I noticed is harder to come and my erection suffers a slightly, unless I take a small dose of Cialis which I normally do every 2 or 3 days. Tren gives that sex aggression but if your prolactin is raised you lose some sensitivity ime