Niharika_sen : you have some solutions which are not medical ,i would say at first that your husband's penis head is very sensitive and when there is excitement he just ejaculate quickly.
1- Try before penetration ,to let him get you high by different methods.
2- Let him wear a condom. A condom reduce sensitivity for sure.
3- when he ejaculates the first time, wait from 20-30 if you still want to have orgasm, and try to turn him on again,for sure the second round he will last more.
but its your job to turn him on.
4-if you are very honest with him and all the previous stuff didnt work.Let him masturbate before having sex.