Hi thanks for contacting HCM .. You are suffering from premature ejaculation.... The common cause lead it is performance anxiety .... So try to avoid stress ....Be relax during sex... Do it in comfortable position..... Sex therapy sessions useful.... Counselling will be useful... Psychiatric might teach you that when its time for urge to ejaculation your partner squeeze your penis middle area for delay ejaculation.... Antidepressant , topical lidicaine are some of drugs that can be used. Smoking and alcohol avoided.... If still biological cause suspected hormonal estimation done for testosterone , prolactine and thyroid profile .... Consult psychiatrist for it ... Take care