i think your boyfriend definitely needs to have his testicles and scrotum evaluated by a urologist. the lack of ejaculation is concerning. asymmetrical testicles could be normal but in light of his other symptoms it would be good to know if he has a large spermatocele varicocele or even a hernia.
if a man's testicles are uneven can there be something wrong? . my bf had a physical for work and the one doing the exam suggested my bf get an examination of his testicles because one hangs way lower than the other one. he isn't one to see a dr unless it is serious. i told him i would google it and see what comes up. he has a large sac and it does get in the way he complains about it but is there a real concern for the position of the actual sacs? as a side note: he rarely ejaculates and has always had this issue.