Hello
Thanks for your query.Based on the facts that you have posted it appears that your boyfriend is getting white milky discharge per
urethra. This is most likely due to excessive secretion of l peri urethral glands located in urethral mucosa which secrete a milky fluid which acts as lubricant for free passage of semen If he does not have any urinary symptoms there is nothing to worry about.This will get resolved itself.
Dr.Pati