By the way, I'm 29yo, very good health and I drink lots of water every day.
Hi, It might be possible that you also have a mild case of epiditymitis or orchitis. (infection of the testicles). If your semen is clumpy and have a slightly red, brown color, it might be the result of the infection.
You want this checked out as repeated incedents can cause problems with fertility.
All the best
Ron