sometimes after masterbation my penis does be really sensitive, and sore if it gets hard again. is this normal? and how often should i be able to cum in the one day?
It may be sore just from the shear use of not being used for a while, being used to much, and/or could depending on how hard your grasp it or your methods. Now if its sore and starting to turn red with almost a dried out feeling after words, try using some lube. Now for your second question, your testicles can only produce so much semen over the course of a few hours. You may notice your first ejaculation may have a large amount, then after that you may have a small amount, then say you go for round 3 you may have one or two drops. Now if your talking about back to back ejaculations, men normally are able to ejaculate every 30 min or so compared to a female whom maybe able to orgasm multiple times with-in a minute. Hope this helps you out any.