Well do I wanna get deep with the answer..?? A few reasons.. I get sensitive nips all the time and a lump develops, take nolva which helps. I'm also sensitive and a quick finisher down there lol and have a hard time if not impossible to go again within a 6 hr period.. guns has said before I may have excess prolactin.. I've done some reading and want to give it a shot and see if shit improves..