It might help a man if he understands some of the reasons why some women have difficulty reaching orgasm. If a woman is stressed, worried and tense, she could unwittingly sabotage her ability to mentally and physically relax. Furthermore, a woman's feelings of being pressured, hurried, or scrutinized can get in her way.
Relaxation is essential to beginning the process that eventually leads to orgasm.
Mistrust, suspicion, or anger can also derail the process. A history of sex-negative messages, such as sex is sinful or genitals are dirty, might inhibit the response. Even the fear of letting go and losing control can stop a woman before she allows herself to plummet over the top. Obviously a history of sexual abuse, exploitation, intimidation or harassment can interfere with a woman's sexual potential. Certain medications, illnesses, surgeries and disabilities can also impact sexual response.