Reaching orgasm is generally easier for men. You might want to ask your partner for longer foreplay, or ask him to use the stop and squeeze technique. With these methods you might delay his ejaculation leaving you enough time to achieve orgasm. If this does not happen, you both might want to visit a sex therapist. He might offer him relaxation techniques and give you support with this issue that might have already altered your perspective of enjoying the intercourse. Orgasm can not achieved artificially with medication.