hii dear 1st u will require proper knowledge of sexual intercourse there are two method of treatment 1st is psychological means counseling stop and start technique is very useful read more ab it in goggle change in position women on top will helpful use condom to decrease penile sensitivity masturbation before sex will increase ur time 2nd is drug therapy medications like dapoxetine 30 mg 1 hour before sex is help ful clomipramine 10 mg daily also beneficial for premature ejaculation no other vitamin supplement or food supplement are useful avoid stress and open communication with partner and helping to each other for better understanding will helpful hope u will get best thank u