Well I have two problems, problem number one I masterbate anywhere between once to three times a day, I have no problem getting off when having sex the first time, but when I go at it the second or third time I find that I rarely can get off, is that due to my masterbation or something else, second question I had a new sex partner recently since I broke up with my GF, since then I have been masterbating like 4-5 times a day I have developed a calous on my penis, Im worried if that is from the masterbation or is it from my new partner, did she give me a disease?