are you sure that it was actual semen which cam from your penis? i don't know of anything you would notice like this sans masturbation (which you never said you weren't doing) unless you had had a wet dream and were waking up to notice that you had ejaculated.
there's really nothing wrong with yellow semen and guys will sometimes notice it after a while without masturbating. that would make sense in this case if you had had a wet dream; it may have been casued by your body's 'need' to ejaculate.
probably the case cause i dont jack off ive been taking it easy lately and i usually have a wet dream twice a week i dont know why but its usually on monday or wensday and on friday or sunday. its usually like i wake up as some is oozing out and then when i wake up its just stops and when i like try to let it out it doesnt move so i have to help it out.
Yellow is normal. Brown could mean blood (particularly if it's brown with a little bit of a red hue). If this is a one-time occurance, it's probably a fluke and not a big deal. But if the brownish color becomes the norm for you, then you might want to call up the doctor after a couple weeks.
Unless you have moral or other reasons for not wanting to masturbate, I recommend that you do just that. For at least the next few days. Masturbate at least a couple of times a day, and my guess is that by the time you've had four or five orgasms your semen will be a more normal color again. If after several ejacualtions over the course of two or three days it is still "brown" I would recommend you get checked out by the doctor just in case you've got an issue with bleeding there...which would under no circumstances be normal.
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