have you shown your partner how you like to be stimulated and how you masturbate?
Have you told him what feels good, and what doesn't, have you maybe lend him a hand while you were having intercourse?
If not: do it now, gal.
Communication is essential for good sex and orgasms. If your partner doesn't know what you like best, and hence busies himself with stuff you only find mediocre, of course orgams won't come. - Also, don't forget that orgasms aren't something that will be "delivered" to you - you have to voice what's good, and there are no rules against stimulating yourself during intercourse either.
And just in case you haven't read it yet, check out Sexual Response and Orgasm – A User’s Guide
Spike: Well, I'm not good and I'm okay.