I haven't masterbated in about a week. Today I did and I noticed that my semen was yellow and not white. After about 2 hours I did it again to make sure, and it was still yellow, and I'm not sure if I saw any blood it in or not. Any ideas?
Semen varies in color. You're fine.
Semen contains several different types of fluids. One, ejaculatory fluid is usually white/creamy in color and consistency. The other, the actual sperm in an ejaculation can be yellowish and jelly like in consistency. Chances are because there had been some time between your most recent masturbations there was more sperm in these and that caused the color change. Sometimes there'll be a tiny bit of blood in one and it'll be more brownish in color. Nothing to worry about either way.
Yeah, mine does the same thing - turns kind of yellowish if I don't ejaculate for a while. It returns to white if I ejaculate often by the next day though.
It has something to do with the prostate fluid which causes the color change. Sperm are so microscopic and only make up less than 5% of the semen volume, that sperm are effectively clear. To prove this, leave your semen sitting out on a table or something for 20-30 minutes, and it should liquify and turn mostly clear. The hundreds of millions of sperm are still in it, swimming fast, yet its clear looking at that point.