Even without orgasm, conception is possible, if the sperm count is normal and female is fertile.
But his problem is he can't ejaculate...
Yes this can be a real problem.Doctor's advice is necessary.It may be possible that he can have precum whch will have some sperms. There will be just a remote chance of conception.Do consult a doctor.
Yes I remember ; there is a retrogary ejaculation. Ejaculation passed to bladder, instead through urethra. In this case also you have to get advice from a doctor...