I have been sexually inactive for eight years and have just had sexual intercourse and my semen was light brown and had streaks of blood .?

Difficult: You have not ejaculated in 8 years? Are you sure it wasn't from the vagina? It could be trauma related or may be related tprone prostate but I have never heard it present this way. If it happens recurrently consider seeing a urologist, .

Probable prostatitis: Blood in the semen (hematospermia) is almost never a sign of serious disease, and likely prostatic in origin. You need to see a urologist for rectal exam and possibly a psa blood test and antibiotics.