Communication is the key, Do you talk to him about this issue? He may not know there is a problem.

Medicines are not good, there are other things to try like - The Squeeze Technique - How To Control Ejaculation

also exercise - Pubococcygeus muscle - Wikipedia, the free encyclopedia

I hope you can resolve your issues Collette hun.xx

one other sugestion is.....

Plan to spend a day with him and suggest seeing how many times you can make love in a day - that way he may take longer each time, if so, once he's managed it for a reasonable amount of time be sure to get extra excited and then tell him that was the longest fuck you'd ever had and that he took u to heights you didnt know existed - tell him that fucking you for longer than usual made you multiple etc etc - really sing his praises....