This depends on the problem. Investigate premature ejaculation and use of medicines and drugs which can cause orgasm problems in men. In particular, medicines in the SSRI group often cause ejaculation problems.

Many somatic illnesses like diabetes, heart and vascular (blood vessel) disease, neurological disorders, hormonal imbalances, chronic diseases such as kidney or liver failure, and alcoholism and drug abuse can cause ejaculation problems. Treatment of such illnesses might help.

The most common cause of ejaculation problems in men is stress. So try to get away from stress. Perhaps making a romantic journey?

Fantasizing might help, Viagra might help.

Trying to concentrate on enjoying intimacy and sex without ejaculation might also help.