I appreciate your comment and that does help. Thank you and if it does happen again we'll be sure to go to a urologist!
Hello,
The semen is produced mainly by the prostate gland. When the prostate contracts at the time of ejaculation, a vein may tear and blood mixes with the semen resulting in a brownish coloured semen which is known as hematospermia. Reddish coloured semen indicates new and dark (brownish) discoloration indicates previous bleeding.
Irritation of the gland (prostatitis) can also cause it to become inflamed and predisposed to bleed. Some factors leading to inflammation include too frequent or too infrequent ejaculation, sexual arousal without ejaculation, withdraw at the time of ejaculation, excessive alcohol or spicy foods, prolonged sitting or bike riding, etc. This can be treated by antibiotics.
If the repeat happens then I suggest your boyfriend to get an evaluation done from a urologist.
I hope it helps. Take care and regards.